Spider doesn't work with ps protocol

mtr --ps spider/bugfix.checksum_table_with_quick_mode_3

Crashes with:
mariadbd: /my/maria-10.6/sql/sql_prepare.cc:4098: bool Prepared_statement::prepare(const char*, uint): Assertion `thd->transaction->stmt.is_empty()' failed.

Works without --ps

The reason for the crash is that in 10.5 one must protect new Independent transactions with 'start_new_trans', which spider doesn't do. This was done to support transactional store engines (and Aria) for MariaDB system tables.