Console Spam: No key replace_with_blackstone

Since loading 21a my console is frequently being spammed with the below msg:

[21:50:16] [Server thread/ERROR]: No key replace_with_blackstone in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key vines in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key overgrown in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key air_pocket in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key mossiness in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key cold in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]
[21:50:16] [Server thread/ERROR]: Exception loading structure piece with id minecraft:rupo
java.lang.RuntimeException: No key replace_with_blackstone in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key vines in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key overgrown in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key air_pocket in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key mossiness in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]; No key cold in MapLike[{AirPocket:1b,Overgrown:0b,Mossiness:0.2f,Cold:0b,Vines:0b,ReplaceWithBlackstone:0b}]
at com.mojang.serialization.DataResult.lambda$getOrThrow$4(DataResult.java:100) ~inecraft_server.20w21a.jar:?]
at com.mojang.datafixers.util.Either$Right.map(Either.java:99) ~inecraft_server.20w21a.jar:?]
at com.mojang.serialization.DataResult.getOrThrow(DataResult.java:93) ~inecraft_server.20w21a.jar:?]
at css.<init>(SourceFile:114) ~inecraft_server.20w21a.jar:?]
at clk.a(SourceFile:137) ~inecraft_server.20w21a.jar:?]
at cgv.a(SourceFile:424) ~inecraft_server.20w21a.jar:?]
at cgv.a(SourceFile:175) ~inecraft_server.20w21a.jar:?]
at yi.l(SourceFile:525) ~inecraft_server.20w21a.jar:?]
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590) [?:1.8.0_222]
at alz.c(SourceFile:144) inecraft_server.20w21a.jar:?]
at yu$a.c(SourceFile:541) inecraft_server.20w21a.jar:?]
at alz.w(SourceFile:118) inecraft_server.20w21a.jar:?]
at yu$a.w(SourceFile:550) inecraft_server.20w21a.jar:?]
at yu.d(SourceFile:280) inecraft_server.20w21a.jar:?]
at net.minecraft.server.MinecraftServer.bd(SourceFile:770) inecraft_server.20w21a.jar:?]
at net.minecraft.server.MinecraftServer.w(SourceFile:758) inecraft_server.20w21a.jar:?]
at alz.c(SourceFile:127) inecraft_server.20w21a.jar:?]
at net.minecraft.server.MinecraftServer.v(SourceFile:743) inecraft_server.20w21a.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:695) inecraft_server.20w21a.jar:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]