GLOBAL debug_dbug setting affected by collation_connection=utf16…

SET collation_connection=utf16le_general_ci;

SET GLOBAL debug_dbug='d,any_random_string';

Will add about 8000-11000 lines of debug information to the error log. However,

SET GLOBAL debug_dbug='d,any_random_string';

Does not. Happens on all 10.2-10.9 debug versions. Tested via CLI only.

Discussed with bar and marko.