With Quark Automation disabled:

Without Quark:

latest.log
https://pastebin.com/sYrUYnk8

I'm not sure whats going on. In second video you sent the observer oes turn off

also do you known which module in particular does this? is it the piston move tile entities one?

also do you known which module in particular does this? is it the piston move tile entities one?

Sorry if the first video wasn’t clear. The first two videos are with all automation settings disabled as then you’d expect vanilla behaviour I thought.

In the first video I place the observer in front of the piston and break the block in front of the observer so the piston is powered and pushes the observer during its pulse. I do the same thing in the third video with Quark removed from the mod list. By doing this with Quark installed with all automation disabled, the observer always stays on.

The second video is to show that it doesn’t always stay on when it isn’t pushed during its pulse. Again with all automation settings disabled.

Didn’t mean to press closed with comment

This looks like a Zeta issue in its piston reimplementation then

I'm quite sure this predates zeta since it seems related to #4556

The Zeta piston implementation is the old Quark piston implementation so it makes sense