Command blocks placed before 18w20a lose commands inside them

When loading chunks that previously had command blocks in them, the command blocks will be there, however the command inside will be lost. Below I have the error log the server provides for each command block loaded.

[03:34:17] [Server thread/ERROR]: Failed to load data for block entity minecraft:command_block

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $ at com.google.gson.internal.Streams.parse(Streams.java:60) ~[minecraft_server.18w20a.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:65) ~[minecraft_server.18w20a.jar:?] at wq.a(SourceFile:493) ~[minecraft_server.18w20a.jar:?] at wq.a(SourceFile:518) ~[minecraft_server.18w20a.jar:?] at ic$a.a(SourceFile:243) ~[minecraft_server.18w20a.jar:?] at bam.b(SourceFile:69) ~[minecraft_server.18w20a.jar:?] at bmj.b(SourceFile:45) ~[minecraft_server.18w20a.jar:?] at bmf.c(SourceFile:78) [minecraft_server.18w20a.jar:?] at bqb.a(SourceFile:496) [minecraft_server.18w20a.jar:?] at bqb.a(SourceFile:101) [minecraft_server.18w20a.jar:?] at si.g(SourceFile:94) [minecraft_server.18w20a.jar:?] at si.b(SourceFile:118) [minecraft_server.18w20a.jar:?] at si.a(SourceFile:160) [minecraft_server.18w20a.jar:?] at net.minecraft.server.MinecraftServer.g_(SourceFile:384) [minecraft_server.18w20a.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:336) [minecraft_server.18w20a.jar:?] at ru.d(SourceFile:248) [minecraft_server.18w20a.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:497) [minecraft_server.18w20a.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $ at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1559) ~[minecraft_server.18w20a.jar:?] at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1401) ~[minecraft_server.18w20a.jar:?] at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:593) ~[minecraft_server.18w20a.jar:?] at com.google.gson.stream.JsonReader.peek(JsonReader.java:425) ~[minecraft_server.18w20a.jar:?] at com.google.gson.internal.Streams.parse(Streams.java:46) ~[minecraft_server.18w20a.jar:?] ... 17 more

I should also mention it is not command specific, due to the large amount of command blocks I had, and how none of them loaded the command.