So as I see you've fixed here:  MC-35765

As I see you've done a great job at fixing the issue but seems like there are still a few issues

for example:
The language fix works only after actually sending the text but not on the client-side!
Let's take the word "שלום" which is in Hebrew (RTL language)
When I try to write it in the text bar I get an unfixed and flipped version of the word :

if I send this text It shows the right text : 

Another really bad issue is the fixing of the RTL languages when you enter an English word inside!
let's say I want to say "The player <player> has died" but in Hebrew which is an RTL language.
"נהרג בקרב <player> השחקן"
I'll add the player's name to show the bug:
"נהרג בקרב RDev_ השחקן"

Can't help but notice that even when I try to use it here I get the same exact issue so I had to engineer writing this text!

If I wanted to write this text without engineering it then the text would be:
"השחקן RDev_ נהרג בקרב"
but the right version is: "נהרג בקרב RDev_ השחקן"

So when I add any English letter the whole sentence would just flip...
here it is in Minecraft as well:

I know the second bug is very very complicated to fix but it is very essential!

Edit: for the second bug shown I have a code that can fix the issue on the server-side, I'll link it here in case it would be helpful to understand the current issue and how to we handle it on the server side to fix it via a spigot plugin.
link: https://github.com/LielAmar/LanguageFix/blob/master/src/main/java/com/lielamar/languagefix/shared/handlers/FixHandlerPost1_16.java