Passkeys stopped working last week - Samsung S25 Ultra

Hello, I have exactly the same problem.
My passkeys for github.com works fine on desktop (Chrome, Firefox, Brave) and worked fine on Android 16 on my Pixel 8 Pro for a long while, but today I noticed that it doesn't work anymore. When my Android is asked for a passkey it will show the passkey popup with Google as provider and "No passkeys available for github.com".

I don't have any passkeys in any provider other than 1Password.

github.com on Chrome/Firefox/Brave all 3 KO (shows Google passkeys popup...empty)
Uber app KO (shows Google passkeys popup...empty)

If I switch password/passkey provider from 1Password to None and back to 1Password no changes. Same thing if I switch to Google then back to 1Password.

But if I use Bitwarden as passkeys provider then it works fine. It's the only one that is working. All others (Proton Pass, 1Password, Microsoft Authenticator, Firefox) shows Google passkey popup.

1Password for Android 8.11.22

I'm also experiencing the same issue: after a while the passkey integration stops working across all applications (Firefox, Chrome, native app). The only workaround I found was to force kill the 1password app and restart it, and then passkeys seem to work again for a while

(Pixel 10 Pro/Android 16)

Same issue on s25 ultra. Force kill doesn't seem to do it for me

Firstly this definitely isn't solved.

I was able to get it to work after no less than two full reboots on my S25. Suddenly 1Pass popped up for passkeys. I don't know how long it will last for but it is intermittent for sure.