Very specific bug which works as described in the title.
Was using the Complementary shader on Aileron for Forge 1.18.2 amongst many other mods in my modpack.
Since the game would freeze up and I'd have to close it manually, there is no crash report, and there's nothing of significance in the log file either. I'd suggest trying to recreate the issue yourselves before looking into this further.
Great mod! This is a relatively minor issue in the grand scheme of things, so don't worry if it can't be fixed.