If there is more than one Elder Guardian around, the jumpscare weakness animation thing can happen more than once.
The command blocks in the video are just to remove the weakness effect.
There are about 45 Guardians in the glass box.
MC-58078
Elder Guardians can do their effect more than once
Resolved
Invalid
0
This is not a bug. For each Elder Guardian, there is a time period until you are affected by the mining fatigue again.