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As an update to this, we do have a fix that is currently being tested by our beta team. Once that has been signed off the fix will be included in the upcoming update to the F28 Professional.
Mark - Just Flight
Just to confirm that I have the same issue
From a few tests, it looks like its an issue with GSX integration.
If I only use the pushback request from GSX and deselect GSX integration from the settings menu on the tablet, brakes work each time.