Parked has been changed by another operation

When parking/unparking fixtures in Hog 4 v3.12.0, a message is frequently displayed with the heading "Object Changed" saying "Parked has been changed by another operation. Would you like to: Ignore / Reload"

I've been hitting "Ignore" every time it comes up since it seems to do nothing. This appears to be a new thing/issue just with v.3.12.0 and only occurs when the Fixture Window is open.

Here's a screenshot of the message: