[MC-133426] Unicode Characters cause JSONReader error

When trying to enter unicode characters as part of a command the game returns an error. Attempted to enter many different characters and this error now comes up. Was not present in pre7. This is returned when trying to run a function that uses a unicode character:

[09:31:10] [ForkJoinPool.commonPool-worker-2/ERROR]: Couldn't load function at dmz:functions/scoreboard_add.mcfunction
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: Whilst parsing command on line 102: Invalid chat component: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $ at position 37: ...ana dummy <--[HERE]
        at java.util.concurrent.CompletableFuture.encodeThrowable(Unknown Source) ~[?:1.8.0_172]
        at java.util.concurrent.CompletableFuture.completeThrowable(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.CompletableFuture.uniApply(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.CompletableFuture$Completion.exec(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.ForkJoinTask.doExec(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source) [?:1.8.0_172]
        at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source) [?:1.8.0_172]
Caused by: java.lang.IllegalArgumentException: Whilst parsing command on line 102: Invalid chat component: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $ at position 37: ...ana dummy <--[HERE]
        at br.a(SourceFile:61) ~[server.jar:?]
        at pp.a(SourceFile:147) ~[server.jar:?]
        ... 7 more

Tried a bunch of different characters. This is what the line in question look like.

scoreboard objectives add Mana dummy ƒ

Happens with all special characters I've tried since updating to pre8.