The new uncompressed brgra was fixed but the problem is that I feel that now you have flipped all blp to RGBA what it shouldn't do. (I can't see the source code so I can see what's going on)
Now blp files that were working correctly before are broken.
To reproduce: 1. Download original blp file from: https://wow.tools/casc/file/chash?contenthash=0f2904231530aed8153d7c04dd466d8f&filedataid=4236523 ...
When I want to merge 5 images, and when I'm using mosaic option with spacing enabled to be 1 or more. The last spacing is doubled or trippled, and I always need to edit the images so I cut the last spacing width.