1.23 does not appear to have fixed the issue with Ruinsmod. With nothing other than Fastcraft 1.23, Ruins and Forge 1558, the Command Blocks still fail to fire off. However, reverting to 1.18 or below still seems to resolve the issue.
If there's some way to try and debug the issue, I'd be more than happy to get a log to you. The debugging section in Fastcraft's .ini doesn't seem like it should track the Ruinsmod issue, but if I'm wrong, let me know.
UPDATE TO LATEST FORGE AND RUINS VERSION TO FIX IT! -> 1.7.10 - 10.13.4.1614
ATOMIC STRYKERS RUINS MOD! -> https://www.dropbox.com/s/z11c…-RUINS-MOD-UNZIP.rar?dl=0 I packed it for you!
Please don't waste players time with issues like this!