Minecraft Username: 314 Brief Description: Bonemeal can be used to break mushroom sin protected regions. Instructions: Go to a protected region. Bonemeal a mushroom. It will disappear. How many times did you recreate this bug?: Once, but seems to be reproducable. Result: The mushroom disappears when it should normally become a huge mushroom. Expected Result: The mushroom to stay and just consume the bonemeal. Evidence: Additional information: Might be good to replace this missing mushroom...
@314, I tried this just to confirm. This is a bug, and it worked for me. The mushrooms have not respawed.
I have removed the decorative mushrooms for now. If anyone has issues with this in a town then the interact flag set to deny does fix this. This option isn't really plausible at spawn though.