all steam engines stop working with the mod installed on a server, the boiler displays the machine as working (level 4, x number of SUs, etc) but the engines are not providing any rotational power or showing as working. it works fine in single player

Can confirm I also experienced the same issue in Forge 1.20.1. Removed it from my modpack as it was causing plenty of issues on a server facing clients.

Noticed it caused more stress to other sets of machines when updating it by placing a shaft where no steam engines were available but I had the same problem with Forge 1.20.1 : It stopped and afterwards couldn't start no more, shafts didn't update their textures.

Please provide both server and client logs

Please provide both server and client logs

Issue:
When using the Create: Power Loader mod on a dedicated server, Create steam engines stop being self-sufficient. The exact same setup works perfectly in singleplayer.

Logs:
I ran:

cat mclog.txt | grep create_power

This is the only related message:

[19:13:23.655] [main/WARN] [mixin/]: Reference map 'create_power_loader.refmap.json' for create_power_loader.mixins.json could not be read. If this is a development environment you can ignore this message

Note:
I prefer not to share the full log publicly as it contains private info (e.g., public IPs).

I couldn't reproduce this bug with my dedicated server setup, but I'm pretty sure this is due to incorrect stress impact registration. The fix will be released very soon.