Observer can't detect changes in the note block

[ABKQPO]

Initial Questions

• I have searched this issue tracker and there is nothing similar already, and this is not on the list of known issues. Posting on a closed issue saying the bug still exists will prompt us to investigate and reopen it once we confirm your report.
• I have verified that this issue occurs in a SUPPORTED environment, meaning I can reproduce this WITHOUT OptiFine, and without Bukkit+Forge server software like KCauldron, Thermos, Crucible, Mohist etc

Mod Version

etfuturum-2.6.0-master.40+47e7965a12.jar

Describe the Issue

Yes, that's right. I'm not sure if it's due to the working principle of the note block

Conflicting Mods

No response

Crash Report

No response

Other Details

No response

[Roadhog360]

This is not fixable. Note blocks do not fire updates in 1.7.10.