When typing in a script like Cyrillic, the text instead of being "хелоѵ", ends up being "?????" in the chat log.
An example JSON entry:

{
	"translate": "chat.type.text",
	"with": [
		{
			"insertion": "SomeName23",
			"clickEvent": {<...>},
			"hoverEvent": {<...>},
			"text": "SomeName23"
		},
		{
			"text": "?????"
		}
	]
}

( less important stuff has been abbreviated with <...> )

This seems like a language or serialization issue, so it might be a little more difficult to fix. I'll look into this.

Working on a bug fix, so far in development it seems to have fixed itself so maybe it's just a 1.19 text serializing issue. I'll update if anything new comes up

Huh, that sounds like good news! x)

Unfortunately it still seems to be broken, I have one more trick up my sleeve to try and fix this. So sorry for the inconvenience.

I have a potential solution that I can try soon, but it would be released as a separate hotfix.
I think saving to file a hex representation of the character and then restoring it could work (ex, § as /0167).

Will be fixed tonight!! Very sorry for the huge wait, it was an issue with text encoding.

You can use the update by getting the artifact from the Actions page.

Reinvestigating this.