IronFox (Mull fork) now has an F-Droid repo

Yep..so far exactly the same experience

Yep, same here.

The developer quit

https://lemmy.ml/post/23956067

The DivestOS dude is retiring

Now I don't have to worry about having to check every so often to see if they've updated by going to their gitlab!

You might want to look into Obtainium if you have any other apps you do that with. You add a link to GitHub, GitLab, Codeberg, etc. into Obtainium for whichever apps you want to track, and Obtainium will automatically check each source in the background every six hours or whatever.

https://github.com/ImranR98/Obtainium

Get Android app updates straight from the source.

Obtainium allows you to install and update apps directly from their releases pages, and receive notifications when new releases are made available.

No longer maintained.

DivestOS went EOL : https://divestos.org/pages/news#end

I think I figured it out. I just ran into that issue on my tablet, and noticed I had the old C# version of Bitwarden (https://github.com/bitwarden/mobile) installed there instead of the newer native version (https://github.com/bitwarden/android) that I have on my phone. After uninstalling and then installing the native version, it works with IronFox properly.

Maybe bitwarden has a hardcoded list of browsers and defaults to the app id otherwise? There could also be an override, but if not you'd have to open an issue with bitwarden and wait for them to update their list.

Edit:
Looking into the code there is indeed a hardcoded list.
This file contains the code

 undefined

    
// Docs state that password fields cannot be reliably saved in Compat mode since they will show as
// masked values.
bool? compatRequest = null;
if (Build.VERSION.SdkInt >= BuildVersionCodes.Q && fillRequest != null)
{
    // Attempt to automatically establish compat request mode on Android 10+
    compatRequest = (fillRequest.Flags | FillRequest.FlagCompatibilityModeRequest) == fillRequest.Flags;
}
var compatBrowser = compatRequest ?? CompatBrowsers.Contains(parser.PackageName);

  

I read this as:
There are browsers that do "native" autofill and ones that do "compat". Mull and ironfox do compat.
This compat support is communicated on Android 10+, but either on older android or maybe if the app is built for older android (?) it won't be communicated, thus the hard coded list.

Doesn't look like there is a way for users to add to this list.