Hey, I have tried to reproduce your issue. But with a fresh install of 0.17.79 and the newest version of Modular Chests I can't find any issues.
I don't know if any other mods could cause an issue, or maybe you're trying to use an older version of the mod?
If you still have an issue with the mod running without any other mods enabled, or if you figure out what other mod causes issues, I would be happy to look into the problem for you. But without any more info on what exactly the issue is, or what causes it, there isn't much I can do.
