Insert on delete-marked record can wrongly inherit old values for instantly added column

--source include/have_innodb.inc

SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;

SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;

CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE = InnoDB  ;

INSERT INTO t1 SET a = 1;

ALTER TABLE t1 ADD COLUMN b TEXT;

BEGIN;

UPDATE t1 SET b = REPEAT('1', @@innodb_page_size / 2);

UPDATE t1 SET a = 2;

INSERT INTO t1 SET a = 1;

DELETE FROM t1;

COMMIT;

--source include/wait_all_purged.inc

DROP TABLE t1;

SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;

mysqld: /mariadb/10.3/storage/innobase/buf/buf0buf.cc:4948: buf_block_t* buf_page_get_gen(const page_id_t&, const page_size_t&, ulint, buf_block_t*, ulint, const char*, unsigned int, mtr_t*, dberr_t*): Assertion `mode == 16 || mode == 12 || !fix_block->page.file_page_was_freed' failed.

…

buf/buf0buf.cc:4953(buf_page_get_gen(page_id_t const&, page_size_t const&, unsigned long, buf_block_t*, unsigned long, char const*, unsigned int, mtr_t*, dberr_t*))[0x55fedca5a27c]

btr/btr0cur.cc:7848(btr_free_externally_stored_field(dict_index_t*, unsigned char*, unsigned char const*, unsigned long const*, page_zip_des_t*, unsigned long, bool, mtr_t*))[0x55fedca5a7dd]

btr/btr0cur.cc:7950(btr_rec_free_externally_stored_fields(dict_index_t*, unsigned char*, unsigned long const*, page_zip_des_t*, bool, mtr_t*))[0x55fedca54d2e]

btr/btr0cur.cc:5651(btr_cur_pessimistic_delete(dberr_t*, unsigned long, btr_cur_t*, unsigned long, bool, mtr_t*))[0x55fedc96fd8a]

row/row0purge.cc:178(row_purge_remove_clust_if_poss_low(purge_node_t*, unsigned long))[0x55fedc96feb8]

row/row0purge.cc:223(row_purge_remove_clust_if_poss(purge_node_t*))[0x55fedc971766]

row/row0purge.cc:806(row_purge_del_mark(purge_node_t*))[0x55fedc972c55]

row/row0purge.cc:1187(row_purge_record_func(purge_node_t*, unsigned char*, que_thr_t const*, bool))[0x55fedc972f6d]