Yes, go ahead and file the bug. And as others mentioned already, the custom screensaver modifications of XScreensaver like for LM may have bugs. The author of XScreensaver has been complaining about this several times.
Unlocking a machine locked with Xfce’s screensaver xfce4-screensaver has long been a simple matter of turning two monitors on at the exact same time. That makes Xfce4-screensaver versions prior to 0.1.9 segfault and crash - leaving the machine unlocked. This very unfortunate Xfce bug #16102 has been open since October 29th 2019 and we have pointed fingers at it several times before. Xfce developer Sean Davis has finally closed this gaping security hole. He explained that the embarrassingly long delay before this security vulnerability was addressed was due to “real life conflicts” in a brief comment on March 22nd. He did not elaborate and we did not ask for further details since it is likely none of our business.