The script "Load files into stack" throws an error

When I try to load 3 tiff files into layers with the script "Load files into stack" it fails with an errormessage on screen:

The files are normally accessible, do not have duplicate filenames, do not reside in folders with weird characters or whatever.
The Lear how to fix button shows a page that does not reflect the fact that this error is thrown from a built in script.

Please advise 🙂

edit: it works OK in Photoshop 2024 (the NON-beta version)

edit 2: My beta version is up-to-date: 2.5.5