Can't invite a friend on current steam (linux)

[OParczyk]

I'm running Steam version 1716584667, build date 2024-05-24 (from the stable channel) on a current debian 12 install.
RemotePlayWhatever is freshly built from source.

When I try to invite a friend, either directly or by clicking on "Create guest invite link", the following happens:
If the steam overlay is open in the game, the overlay often freezes and I can't get out of it, no window opens.
If the steam overlay is not currently open no link is sent or generated, but when I then open the steam overlay, the "Remote Play" window is open and I can even click on "Invite Friend" there and select one, but still no invite is sent or generated.
"Invite Guest" in that case has no effect at all, but after a time the overlay may freeze again.

I've tested this with multiple games I've bought on steam.

Could you have a look?

[m4dEngi]

If it is a non-steam game, you will need to send invites using the RemotePlayWhatever app instead.

[OParczyk]

Thank you for having a look!

All games I tried are steam games.
I used the Buttons in the RemotePlayWhatever app:

When I try to invite a friend, either directly or by clicking on "Create guest invite link", the following happens:

was meant as happening inside the RemotePlayWhatever window. I did try sending a friend invite through that as it worked before the update, but now no invites are sent. The steam overlay does weird stuff as described, tho.

[MiraiiF]

My distro is Arch, with KDE (with Xorg), using the AppImage.
The same is happening to me in older versions of the app.
In newer versions, it just crashes with a gtk error gdk-pixbuf-error-quark 3 whenever I click in a button. And yeah, I tried updating the MIME base and querying the pixbuf loaders. Nothing changed (maybe a dependency issue?).
Still, even if the crash stopped happening, I think that the app would continue to behave as the older versions of it to me:
I click on a friend. A confirmation box appears, but after confirming it the "invite sent" box simply doesn't appear. After these events, now on steam, it shows like I'm in a remote playing session but I can't invite anyone, just as the author of this post mentioned.
If I click in the button to share the link, nothing happens.