I've just upgraded Fedora 33 to Fedora 34, and along with this openssh 8.4 to openssh 8.5
And some of ssh config stopped working.

My case:
[torzechowski@fedora ~]$ grep '#' -i .ssh/config | tail -1
User torzechowski#10.2.128.32

Intended username to pass to server is "torzechowski#10.2.128.32", but due to fix was made it's shortened to "torzechowski".

(hash is used by PIM/PAM system as delimiter)

For me it's a regression. And looking at the code I see no way for workaround - no quoting or escaping, because config line is simply chopped at hash sign.

Currently I have to pass login in command line, so read_config_file_depth() will not interfere.

Related: bz#2320
https://github.com/openssh/openssh-portable/commit/2bcbf679de838bb77a8bd7fa18e100df471a679c