main.func_json_notembedded : MDEV-30518 / MDEV-27955
main.index_merge_innodb : MDEV-30728
main.mysql_upgrade : https://bugs.debian.org/1053486
maria.maria-purge : MDEV-31349
type_test.type_test_double : MDEV-22243, but wasn't actually fixed yet
unit.conc_connection : CONC-640: unit.conc_connection fails on test_conc21