If using 1.12.2 (without forge) client will crash on advancements gui open when on glowstone server. It's related to test advancement and the fact that it doesn't have background set in AdvacementsDisplay.
Here the stacktrace of client crash:
java.lang.NullPointerException: Registering texture
at cdt.a(SourceFile:215)
at cdm.a(SourceFile:46)
at cdr.a(SourceFile:60)
at cdr.a(SourceFile:42)
at blx.f(SourceFile:96)
at bmb.c(SourceFile:138)
at bmb.a(SourceFile:118)
at buq.a(SourceFile:1079)
at bib.az(SourceFile:1023)
at bib.a(SourceFile:419)
at net.minecraft.client.main.Main.main(SourceFile:123)
If using 1.12.2 (without forge) client will crash on advancements gui open when on glowstone server. It's related to test advancement and the fact that it doesn't have background set in AdvacementsDisplay. Here the stacktrace of client crash: