Merging a group lowers the transparency of layers within that group

[peinamek]

I'm getting weird results when merging a group on the new 21.0.3 ps version. 

Situation:

I have various layers with sketches on each of them. I want to merge them/flatten them but keep the transparency/opacity of the whole sketch. When I merge the group, the transparency/opacity lowers by a few percentage. If I merge the layers individually, they keep their respective transparency/opacity. 

[c.pfaffenbichler]

Could you post screenshots taken at View > 100% of the unmerged and the merged with the Layers Panel visible? 

[peinamek]

First image are layers inside group, one at 50% opacity and the second at 75% opacity.

Second image is group merged. The strokes look lighter. 

And just out of experimenting, look what happens when I merge a group inside a group

[Bojan Živković]

I am on Windows with latest updates for OS and Photoshop and can not reproduce your problem. Using Merge Group command and Ctrl + E shortcut to merge group.

[peinamek]

I think I found the problem, I'm using the under color settings, the Blend RGB colors using gamma with a value on 1. I didn't have these problems before and I was working with previous versions.