Safari plugin frequently logs out

Running MacOS 11.5.2, Safari 14.1.2 and Bitwarden Safari plugin 1.51.1 .

The Bitwarden plugin frequently logouts out requiring me to enter both the master password and provide my 2FA key. This is annoying as the plugin is only configured to timeout on browser restart and the timeout action is set to Lock not Logout. Lock should only require the master password, not the additional 2FA factor.

The full desktop app honours these settings correctly and behaves as expected but the plugin doesn’t. I am finding the plugin logs me out about once every couple of days. This occurs even when Safari has not restarted.

Anyone else experience this? Is it a bug or expected behaviour? Any way to fix it?