For me, in the mount tab (Ctrl K, tab mount, i unpark mount, goto a star, the park button is grey (mount is really unparked)
If I click on the park button, it instantly turns gray (parked mount) as the mount continues to move to the park point.
I can click on the unpark button while the mount is not yet parked (it is moving to its park position). So the mount stops where it is. and goes into tracking.
Maybe this is the normal operation.
The only problem is that the automatic sequence stops when the mount is not yet parked.

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