Failed to save chunk: No enum constant bgg when upgrading from 1.12.2 to 1.13-Pre7

bna

Failed to save chunk java.lang.IllegalArgumentException: No enum constant bgg. at java.lang.Enum.valueOf(Enum.java:238) at bgg.valueOf(SourceFile:7) at bvt$a.a(SourceFile:96) at bwh.a(SourceFile:102) at bwe.b(SourceFile:123) at bwi.a(SourceFile:146) at bwe.a(SourceFile:103) at bvv.a(SourceFile:166) at bvv.a(SourceFile:81) at bna.b(SourceFile:104) at bna.a(SourceFile:220) at tw.a(SourceFile:96) at tw$$Lambda$1893/1162572111.accept(Unknown Source) at java.lang.Iterable.forEach(Iterable.java:75) at tw.a(SourceFile:91) at tb.d(SourceFile:282) at tc.i_(SourceFile:200) at net.minecraft.server.MinecraftServer.w(SourceFile:689) at net.minecraft.server.MinecraftServer.v(SourceFile:622) at dfi.v(SourceFile:157) at net.minecraft.server.MinecraftServer.run(SourceFile:525) at java.lang.Thread.run(Thread.java:745)