Install and Refresh Failed: NSCocoaErrorDomain 512

[breadone]

As of a few days ago, it seems like i can't refresh any third party app or install new ones, as they all fail due to similar errors, but with the same error code NSCocoaErrorDomain 512:
"The file couldn't be saved in the folder .ljproj"

Altstore version 2.0 on iOS 18.1pb2 (22B5054e)
Altserver version 1.7.2 on macOS 15.0 (24A335)

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