Minecraft: 1.21.
Mod version: 1.21-21.0.3
Modpack: Opolis Inc vB7.0

I set up a quarry in a warm ocean chunk. When it got down to where there were bubbles made by a Magma Block, the quarry stopped working. Removing the Magma Block caused the quarry to start up again. I think it is the bubbles caused by the Magma Block that is the problem.

Let me know if you need any other info. Thanks.