InnoDB: using atomic writes.
2020-08-08  1:13:58 0 [Note] InnoDB: Uses event mutexes
2020-08-08  1:13:58 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-08-08  1:13:58 0 [Note] InnoDB: Number of pools: 1
2020-08-08  1:13:58 0 [Note] InnoDB: Using SSE4.2 crc32 instructions
2020-08-08  1:13:58 0 [Note] InnoDB: Initializing buffer pool, total size = 8589934592, chunk size = 134217728
2020-08-08  1:13:59 0 [Note] InnoDB: Completed initialization of buffer pool
2020-08-08  1:13:59 0 [Note] InnoDB: 128 rollback segments are active.
2020-08-08  1:13:59 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2020-08-08  1:13:59 0 [Note] InnoDB: Setting file '.\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2020-08-08  1:13:59 0 [Note] InnoDB: File '.\ibtmp1' size is now 12 MB.
2020-08-08  1:13:59 0 [Note] InnoDB: 10.5.4 started; log sequence number 45041; transaction id 21
2020-08-08  1:13:59 0 [Note] Plugin 'FEEDBACK' is disabled.
2020-08-08  1:13:59 0 [Note] InnoDB: Loading buffer pool(s) from C:\Program Files\MariaDB 10.5\data\ib_buffer_pool
2020-08-08  1:13:59 0 [Note] InnoDB: Buffer pool(s) load completed at 200808  1:13:59
2020-08-08  1:13:59 0 [Note] Server socket created on IP: '::'.
2020-08-08  1:13:59 0 [Note] Reading of all Master_info entries succeeded
2020-08-08  1:13:59 0 [Note] Added new Master_info '' to hash table
2020-08-08  1:13:59 0 [Note] C:\Program Files\MariaDB 10.5\bin\mysqld.exe: ready for connections.
Version: '10.5.4-MariaDB'  socket: ''  port: 3306  mariadb.org binary distribution
2020-08-08  1:21:37 3 [ERROR] InnoDB: Record in index `ParentID` of table `test`.`child` was not found on update: TUPLE (info_bits=0, 3 fields): {NULL,[1] (0x01),[4]   5(0x0001E535)} at: COMPACT RECORD(info_bits=0, 3 fields): {NULL,[1] (0x01),[4]   ~(0x0001E47E)}
2020-08-08 01:21:37 0xb74  InnoDB: Assertion failure in file D:\winx64-packages\build\src\storage\innobase\row\row0ins.cc line 218
InnoDB: Failing assertion: !cursor->index->is_committed()
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to https://jira.mariadb.org/
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: https://mariadb.com/kb/en/library/innodb-recovery-modes/
InnoDB: about forcing recovery.
200808  1:21:37 [ERROR] mysqld got exception 0x80000003 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed, 
something is definitely wrong and this may fail.

Server version: 10.5.4-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=1
max_threads=65537
thread_count=2
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 136407 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x1a8f484f068
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
server.dll!my_parameter_handler()[my_init.c:281]
ucrtbase.dll!raise()
ucrtbase.dll!abort()
server.dll!ut_dbg_assertion_failed()[ut0dbg.cc:60]
server.dll!row_ins_sec_index_entry_by_modify()[row0ins.cc:218]
server.dll!row_ins_sec_index_entry_low()[row0ins.cc:3052]
server.dll!row_ins_sec_index_entry()[row0ins.cc:3266]
server.dll!row_upd_sec_index_entry()[row0upd.cc:2220]
server.dll!row_upd()[row0upd.cc:3024]
server.dll!row_upd_step()[row0upd.cc:3142]
server.dll!row_update_cascade_for_mysql()[row0mysql.cc:2254]
server.dll!row_ins_foreign_check_on_constraint()[row0ins.cc:1395]
server.dll!row_ins_check_foreign_constraint()[row0ins.cc:1802]
server.dll!row_upd_check_references_constraints()[row0upd.cc:299]
server.dll!row_upd_del_mark_clust_rec()[row0upd.cc:2697]
server.dll!row_upd_clust_step()[row0upd.cc:2866]
server.dll!row_upd()[row0upd.cc:2995]
server.dll!row_upd_step()[row0upd.cc:3142]
server.dll!row_update_for_mysql()[row0mysql.cc:1889]
server.dll!ha_innobase::delete_row()[ha_innodb.cc:8646]
server.dll!handler::ha_delete_row()[handler.cc:7256]
server.dll!mysql_delete()[sql_delete.cc:794]
server.dll!mysql_execute_command()[sql_parse.cc:4787]
server.dll!mysql_parse()[sql_parse.cc:7997]
server.dll!dispatch_command()[sql_parse.cc:1877]
server.dll!do_command()[sql_parse.cc:1355]
server.dll!threadpool_process_request()[threadpool_common.cc:354]
server.dll!tp_callback()[threadpool_common.cc:194]
ntdll.dll!TpReleaseWait()
ntdll.dll!RtlInitializeResource()
KERNEL32.DLL!BaseThreadInitThunk()
ntdll.dll!RtlUserThreadStart()

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x1a8f485e440): DELETE FROM parent WHERE ID=1000
Connection ID (thread ID): 3
Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
Writing a core file at C:\Program Files\MariaDB 10.5\data\
InnoDB: using atomic writes.
2020-08-08  1:21:55 0 [Note] InnoDB: Uses event mutexes
2020-08-08  1:21:55 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-08-08  1:21:55 0 [Note] InnoDB: Number of pools: 1
2020-08-08  1:21:55 0 [Note] InnoDB: Using SSE4.2 crc32 instructions
2020-08-08  1:21:55 0 [Note] InnoDB: Initializing buffer pool, total size = 8589934592, chunk size = 134217728
2020-08-08  1:21:55 0 [Note] InnoDB: Completed initialization of buffer pool
2020-08-08  1:21:55 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=12939566
2020-08-08  1:21:55 0 [Note] InnoDB: 1 transaction(s) which must be rolled back or cleaned up in total 2 row operations to undo
2020-08-08  1:21:55 0 [Note] InnoDB: Trx id counter is 67
2020-08-08  1:21:55 0 [Note] InnoDB: Starting final batch to recover 4 pages from redo log.
2020-08-08  1:21:56 0 [Note] InnoDB: 128 rollback segments are active.
2020-08-08  1:21:56 0 [Note] InnoDB: Starting in background the rollback of recovered transactions
2020-08-08  1:21:56 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2020-08-08  1:21:56 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2020-08-08  1:21:56 0 [Note] InnoDB: Setting file '.\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2020-08-08  1:21:56 0 [Note] InnoDB: File '.\ibtmp1' size is now 12 MB.
2020-08-08  1:21:56 0 [Note] InnoDB: Rolled back recovered transaction 66
2020-08-08  1:21:56 0 [Note] InnoDB: Rollback of non-prepared transactions completed
2020-08-08  1:21:56 0 [Note] InnoDB: 10.5.4 started; log sequence number 12940547; transaction id 70
2020-08-08  1:21:56 0 [Note] Plugin 'FEEDBACK' is disabled.
2020-08-08  1:21:56 0 [Note] InnoDB: Loading buffer pool(s) from C:\Program Files\MariaDB 10.5\data\ib_buffer_pool
2020-08-08  1:21:56 0 [Note] Server socket created on IP: '::'.
2020-08-08  1:21:56 0 [Note] InnoDB: Buffer pool(s) load completed at 200808  1:21:56
2020-08-08  1:21:56 0 [Note] Reading of all Master_info entries succeeded
2020-08-08  1:21:56 0 [Note] Added new Master_info '' to hash table
2020-08-08  1:21:56 0 [Note] C:\Program Files\MariaDB 10.5\bin\mysqld.exe: ready for connections.
Version: '10.5.4-MariaDB'  socket: ''  port: 3306  mariadb.org binary distribution
2020-08-08  1:23:38 0 [Note] C:\Program Files\MariaDB 10.5\bin\mysqld.exe (initiated by: unknown): Normal shutdown
2020-08-08  1:23:38 0 [Note] Event Scheduler: Purging the queue. 0 events
2020-08-08  1:23:38 0 [Note] InnoDB: FTS optimize thread exiting.
2020-08-08  1:23:38 0 [Note] InnoDB: Starting shutdown...
2020-08-08  1:23:38 0 [Note] InnoDB: Dumping buffer pool(s) to C:\Program Files\MariaDB 10.5\data\ib_buffer_pool
2020-08-08  1:23:38 0 [Note] InnoDB: Buffer pool(s) dump completed at 200808  1:23:38
2020-08-08  1:23:38 0 [Note] InnoDB: Shutdown completed; log sequence number 12944882; transaction id 85
2020-08-08  1:23:38 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2020-08-08  1:23:38 0 [Note] C:\Program Files\MariaDB 10.5\bin\mysqld.exe: Shutdown complete