LandOfSignals and/or UniversalModCore seem to have problems regarding the cache after reentering a world.
Do we have to free OBJRender instances?

Interesting:
https://github.com/TeamOpenIndustry/ImmersiveRailroading/blob/master/src/main/java/cam72cam/immersiverailroading/ImmersiveRailroading.java#L205

Fixed with UMC 1.1.4 for vulnerable mc versions.