The UI in RTL languages is the same as in LTR languages
Usually, UI in right-to-left languages is flipped.
The text is aligned to the right, the default active tab is in the right, the highest value in a slider is on the left and so on.
That's not the case in Minecraft, and it is confusing when using Minecraft in RTL language.
I tried to find older bug reports of this issue, and didn't find any.