Problem with Object Mask Tool tracking

I am so far really excited about the new automatic object mask tool in Premiere Pro Beta. However, I am encountering a problem with tracking. After creating the mask, when I go to track if forward through the clip, after about 5-6 seconds of tracking I get the following error message:

"Object mask data write failure. Failed to store Object Mask data due to a disk error. Your tracking data will be discarded."

If I start tracking, then click "Stop" after about 2-3 seconds, then tracking is saved. If I then repeat this process, track forward + stop after 2-3 seconds I can make it through a 20 second clip without error messages or loss of data. But as stated above not when I track the whole thing at once.

I am on Win 11 with 64 GB Ram and an AMD Ryzen 7 3700X 8-core.

/Markus