If the message body contains (or at least, begins with) RTL script, it should be right-aligned in the message panel rather than left-aligned
Message panel !== RTE so I'm gonna remove the RTE label (unless this is also a problem in the composer?)
Looking into this, the following changes need to be made:
.mx_EventTile_body {
...
+ text-align: -webkit-auto;
+ display: block;
}
I'm not sure how this will affect all other uses of event tiles, so should be worth testing thoroughly.
Also, I wonder if the interface needs a "RTL-mode" - having the user's avatar all the way on the left seems strange when the text is aligned to the right.

Wouldn't it be solved by adding text-aligh: start? So it automatically and based on direction of the text will determine to align text on left or right.
Hi guys. How to fix rtl right-justified?

You can see It's left-justified.
OS: Ubuntu 20.04
App: Element Desktop