What Happened:
I drank milk while under mining fatigue given by an Elder Guardian. This worked as expected (It removed the status effect) But now when I receive mining fatigue again it is immediately removed AND any other status effect I have. This results in the mining status effect appearing for a brief moment in my inventory screen and then disappearing along with any other effects I have...like water breathing etc.

Death and Server Restarts are not fixing this...it is for all intents permanent. I am actually the account holder/OP of the Realms trial server this issue has afflicted, so an interested Mojang party is welcome to login / look at my player data to help troubleshoot this issue. The trial server is on my account (russec) and is on my particular player.

I see this was reported in some form before and closed as Unable to repro: MC-79778

Thanks for considering taking a 2nd crack at debugging this one. It's a real curse actually.