If I pick my fish shell up, and type: etu@workstation ~ $ ?

The suggestion will suggest: etu@workstation ~ $ ?ython, which seems like it matches python, and I can even tab-complete to get the entire string ?ython.

Also works if I type like etu@workstation ~ $ sh?1 -> etu@workstation ~ $ sh?1sum

It's possible to complete these commands, but not to run them, becouse the command doesn't exist, fish tells me fish: Illegal command name “?ython” for example.

(And, I don't know why the heck anyone would type ? in their prompt while typing a command, but it seems strange that's it's possible to complete a command that doesn't exist)