As soon as I try merging layers or applying layer masks, I risk getting destructive errors like in the picture below. Sometimes it is permanent, sometimes it only appears when zoomin in or out of the image and sometimes it vanishes, when I restart Photoshop. But mostly it stays and I have to do my work all over.
Additional notes just in case these are important for bug fixing: - I have a lot of adjustment layers on top of this file in the group. - The blend mode of the merged layers is not relevant. - Hiding or deleting the merged layer does not fix this problem once it has occured, the file stays corrupted. Undoing the merging does not fix the problem either. - It does not matter if the file is .psd or .psdc