UBSAN runtime error: downcast of address which does not point to an object of type 'Item_cond'

CREATE TABLE t (a INT NOT NULL);

INSERT INTO t VALUES (1),(2); # Optional, fails either way

SELECT * FROM t WHERE (a = 1 OR a = 5) AND (a IS NULL OR a = 1);

# Cleanup

DROP TABLE t;

/data/src/10.5/sql/sql_select.cc:17728:9: runtime error: downcast of address 0x7fe4c00178f8 which does not point to an object of type 'Item_cond'

0x7fe4c00178f8: note: object is of type 'Item_equal'

 a5 a5 a5 a5  28 f6 dd 5d 94 55 00 00  15 00 00 00 00 00 00 00  00 a5 a5 a5 a5 a5 a5 a5  20 fc 33 60

              ^~~~~~~~~~~~~~~~~~~~~~~

              vptr for 'Item_equal'

/data/src/10.5/sql/sql_select.cc:17728:42: runtime error: member call on address 0x7fe4c00178f8 which does not point to an object of type 'Item_cond'

0x7fe4c00178f8: note: object is of type 'Item_equal'

 a5 a5 a5 a5  28 f6 dd 5d 94 55 00 00  15 00 00 00 00 00 00 00  00 a5 a5 a5 a5 a5 a5 a5  20 fc 33 60

              ^~~~~~~~~~~~~~~~~~~~~~~

              vptr for 'Item_equal'

/data/src/10.5/sql/sql_select.cc:17731:8: runtime error: downcast of address 0x7fe4c00178f8 which does not point to an object of type 'Item_cond'

0x7fe4c00178f8: note: object is of type 'Item_equal'

 a5 a5 a5 a5  28 f6 dd 5d 94 55 00 00  15 00 00 00 00 00 00 00  00 a5 a5 a5 a5 a5 a5 a5  20 fc 33 60

              ^~~~~~~~~~~~~~~~~~~~~~~

              vptr for 'Item_equal'

/data/src/10.5/sql/sql_select.cc:17731:41: runtime error: member call on address 0x7fe4c00178f8 which does not point to an object of type 'Item_cond'

0x7fe4c00178f8: note: object is of type 'Item_equal'

 a5 a5 a5 a5  28 f6 dd 5d 94 55 00 00  15 00 00 00 00 00 00 00  00 a5 a5 a5 a5 a5 a5 a5  20 fc 33 60

              ^~~~~~~~~~~~~~~~~~~~~~~

              vptr for 'Item_equal'