Mask tracking not moving forward. Hangs on Tracking - Progress ...

This is a bad answer but might function as a workaround for you before someone more knowledgeable answers -
I had this problem today tracking simple movement in high-contrast areas (light boats moving on dark water). Some boats would be tracked without issue on the first click, others that looked identical in speed/color/contrast would hang indefinitely on Tracking - Progress...
What worked for me:

1. Cancel out if it hangs on "Progress" (if the bar begins to fill just wait - you should be in good shape)
2. Adjust the mask slightly (reposition a node, or move the entire mask). Then reposition where you need it to be.
3. Try tracking again
4. Repeat until Premiere decides to track

Again, this is not a great answer - but it did work for me as a workaround. Here's hoping someone more knowledgeable has a better solution!

I just tried this to solve this issue as well and it's working again.

https://support.apple.com/nl-nl/guide/mac-help/mh43185/mac