Hot fix for crashes when pushing certain blocks with pistons – there were some bugs in the custom piston logic used to implement Quark's "chains connect blocks" feature.
You can get it here https://www.curseforge.com/minecraft/mc-mods/zeta/files/6363524 or there https://modrinth.com/mod/zeta/version/1.20.1-1.0-29 .
Happy pistoning!!!