Session often lost after locking screen with multiple displays

Often, but not always when the screen is locked I will try to unlock, only to get greeter ask my password twice. It will then take me to an empty desktop, all my open windows are gone.

I disabled sleep, also for lightdm, so that is not the cause.

This is on a Huawei Matebook X Pro laptop With elementary Juno. I'm using an external monitor most of the time and have the lastest 18.04 HWE installed