There an wrong rendering for Arabic text in impress and calc step to reproduce: 1- open impress or calc 2- write something in arabic with LTR text direction. there are wrong rendering. but when change the text direction to RTL it look good.
Created attachment 80341 [details] bug screenshot
the bug appear on some fonts like Lohit Hindi
That font looks like Free Serif, could ypu check if the issue persists of you select that font explicitely? If so, please provide the version of the font.
Created attachment 80345 [details] screenshot using KacstBook
Created attachment 80346 [details] Screenshot using amiri when you using other fonts it will be add more kashida on LTR than RTL.
Confirmed on LO4.1 Beta
We have reverted the fix for the bug #60533, so this should work again.