Hooray, success (I hope)! I reinstalled Kstars and performed a full-upgrade. Now refocusing on filter change seems to work again in Nightly. At least the first change went smoothly as expected.
I am letting it run through the night, will recheck in the morning. Will also check whether this translates to independent builds as well.
I hope that settles it. This has been driving me crazy for the last 10 days or so.

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