Cannot name a costume a name with (

Bug reports Snap! Bugs
1

If you rename a costume to a name that contains the ( character, that character and all the characters after it are stripped away. This also allows costumes with a problematically empty name to exist and even duplicate names.

For some reason, that does not happen to sounds or other renameable objects.

2

if the costume is renamed ( it appears as [close V] ::looks reporter in the costumes menu

3

That happens because dropdowns in blocks still show a mysterious "close" option whenever there is no value.