fish version 4.0.1 on Fedora 42 in Gnome Terminal

I think there is a regression with the behavior of __fish_complete_list, which occurs when the = sign is used after the long option. The --option= part is then repeated for each item completed.
Example:

Type usermod --groups= and complete one group. Then go back, add a , and complete another group. Now the commandline is like usermod --groups=--groups=abrt,adm.

I also checked with an old fish version 3.6.0 on Debian stable and there it works as expected.