Vault timeout on system lock not working cause of "screensaver"

I set my Vault to timeout on system lock but the lock engages every time my monitor’s screen blanks. That is, the computer hasn’t been locked, only the screen blanked to save energy.

Using Debian Linux OS on ThinkPad laptop.

Is there a way to keep the Vault from locking when screensaver activates? Is this a bug that needs reporting to Bitwarden?