SECURITY: Lock screen not blocking keyboard input when laptop lid is closed.

I am using the rolling release of Xubuntu and I have discovered that when I lock the screen with a terminal emulator and close the lid the screen becomes unlocked and allows me to type in commands into the terminal even when locked. I am using a usb keyboard.

Another observation worth mentioning...
When I open the lid the unlocked screen quickly flashes on the screen before quickly locking again.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: xfce4-screensaver 0.1.10-1
ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17
Uname: Linux 5.8.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Fri Dec 18 19:18:39 2020
InstallationDate: Installed on 2020-12-05 (13 days ago)
InstallationMedia: Xubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
SourcePackage: xfce4-screensaver
UpgradeStatus: No upgrade log present (probably fresh install)