Photoshop saves brush data incorrectly when exiting!

Hello everybody,

I am using the PS CC 2020 version 21.1.0 and have found the following problem:

If I import several brush or picture brush packages, the size of which is more than 2 GB, PS seems to update the "brushes.psp" file incorrectly when I quit!

Now the "brushes.psp" file has a size of e.g. 2.6 GB but after restarting Photoshop again all of my imported brushes are disappeared. Only the standard brushes are visible.

If I only import brush packages that are smaller than 2 GB together, it still seems to work!

Has anyone noticed anything similar here?

Thank you for your answers.

Best regards

Frank