I use Proton and they have documented the bug several times. Personally I've noticed it seemed to turn itself off. But it's not just limited to Proton, so beware.

#vpnprivacy #android16 #vpn

Android 16 has a silent VPN-killer bug, claim multiple providers
https://share.google/6ON1mX1wvuX5RgWyu

Android 16 has a silent VPN bug Google hasn't fixed for months, claim multiple VPN providers

Multiple VPN providers are reporting a silent bug on Android 16 that breaks VPN connections after updates.

Android Authority