After last apt-get upgrade Gateway doesn't connect to tor anymore

Updated the workaround in the wiki:

New Whonix release 9.1 coming. (Existing users who applies the workaround do not have to update. Fixes it for new users.)

So with the workaround it works fine, did I get it right that I can’t use bridges this way?
I’ve tried it out before and it won’t bootstrap.

There are no limitations to bridge use. Make sure you got the syntax right. Many were using

--managed

while it’s just

managed

See also Configure (Private) (Obfuscated) Tor Bridges for instructions.