I have this issue with just a single beacon. It was set to Haste 2 (mining improvement). I've changed it to Speed 2, but two times I've rejoined my single player world still have the Speed 2 buff, but immediately get Haste 2 applied and Speed 2 times out. In the beacon UI it has reset to Haste 2.
Rees B
I have this issue with just a single beacon. It was set to Haste 2 (mining improvement). I've changed it to Speed 2, but two times I've rejoined my single player world still have the Speed 2 buff, but immediately get Haste 2 applied and Speed 2 times out. In the beacon UI it has reset to Haste 2.
Running latest Java edition on Windows 7.