New Nighly updates remove support for third-party passkeys (feature broken)

[I-I-IT]

Until a few days or weeks ago, I could enable a flag to have support for third-party passkeys app, such as Proton Pass. (See Proton Pass : how to use passkeys

However this flag is now gone and I therefore can't use passkeys on Brave. Only a pop-up shows with the option to use a physical key or scan a QR code.

My version is 1.68.11 and I have Android 14 (Samsung)
Edit: Works fine on Stable version (1.65.132)

[yschimke]

Also on the Beta release version

[gclawes]

I had to enable the "Temporarily unexpire M124 flags" flag before it allowed me to access the third-party passkey flag again.

[yschimke]

That enables the flag for me, but it's still not finding passkeys once I enable 3rd party password managers.