I’ve seen this as well today with the steam C172 with frequent HDG changes and also with ignored clicks on the upper GPS when attempting to enter a direct course. It eventually frees up to operate normally, but it can take several minutes to do so.
What’s interesting about it in this case is that it’s isolated to a fraction of the displayed area, whereas other screen freezes - that can happen when changing to/from real world weather where the sound continues but the entire sim is frozen and unresponsive up to several minutes before it too recovers.