Squander4 In Vanadium, make sure Autofill is set to "Use other providers" in Vanadium > Settings > Autofill options > Use other providers.
Not sure where you removed Proton Pass, but you can try again from Settings > Passwords & accounts > The cog to the right of Proton Pass in the Passwords, passkeys, and data services section. And, finally, another person said they had issues with autofill and toggled things off then on again, and it finally started working after they reset their phone.