XIBO 4.1.0 issues: Layout thumbnail not available anymore. Display list details missing

Since the 4.1.0 update, the layout thumbnail on the layouts page is not showing anymore. It did before. Now it appears only grey items named Canvas, or other categories.
Also, in the Display list, there are no longer details about the display, only the MAC address. Even the screen shot, requested, does not appear.
These two features are very important to me. They used to work. Is there something I did while update-ing? I run a self hosted CMS in a docker env.
Thank you!

Did see this also and I have made a workaround that solves it meanwhile…
I have added our images in a playlist (usually only one image) and the thumbnail shows now. Also getting less faults in our Android players (from 3.04 - 4.1) my guess is that players refuses some layouts without regions. Just an image in the background don’t work always. We have some older screens with Android, and they acted really strange. I’m also adding Lets encrypt certificates in those old screens, and everything starts working smoother now. We have not filed any reports because everything is to new about 4.1 at the moment…