Mod pack: ATM 8 (1.19.2)
pylons version: 1.19.2-3.1.0

There seems to be no errors, how do I debug this?

You can only break/interact with pylons placed by you, unless you're in creative.

Can I disable that feature somehow? We are playing as a team (3-4 players) and we occasionally need to interact with each others farms.

I'm looking into adding FTB Teams support with a toggle to switch between player-only and team access. Let me know if this would work for your situation.

That would be perfect. Thank you for your time and efforts.

Team support was released in 3.2.0 for 1.19/4.1.0 for 1.20.