Problem after exchanging texture back from video

I’m setting the texture of a panorama stage (sphere) accordingly in my app. My scene uses some 360 textures but also some 360 videos.
Showing the 360 textures is fine until:
I set a video, it plays and look like it should, BUT
after set a texture again: the texture is displayed very dark, look at this:

https://www.dropbox.com/scl/fi/ptbd09psdweeuhhby61rb/AfterVideo.jpg

Seams to be some colorspace/gamma problem V3D catches after the video.
The video is a 7680×3840 360 mono video, H265, al.so tried H264 same problem afterwards.
Verge3D 4.10.pre2 for Blender. Material is just a texture feeding into the material, tried an Emissive shader with texture too, same outcome.
Same problem on Vivaldi, Edge and Firefox.
Only reloading the website (project) leads to normal colors of the textures again. Until the next time a video is loaded.
HELP, this a is a project breaking bug.

• This topic was modified 2 hours, 35 minutes ago by vklein.
• This topic was modified 2 hours, 34 minutes ago by vklein.
• This topic was modified 2 hours, 33 minutes ago by vklein.