The bug
In Programmer Art, the credits now use the menu_background.png texture, which as a file is visually darker than the preceding options_background.png file (a copy of the dirt texture which was darkened by the game code). As a result, the credits background in Programmer Art is darker than it was previously, an unannounced change and a likely oversight.
How to fix
Introduce a dedicated credits_background.png texture file, which would be a copy of the current dirt texture with no changes applied to the brightness, and use this for the credits background in Programmer Art. This would alleviate conflicts like this (and possibly resolve some other issues with the credits background).
Linked issues
discovered while testing 2
relates to 6
Attachments
Comments 1

Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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