Tracking & Kerning issues while writing URDU Language in InDesign latest version 19.4

Well, Harshika asked you to provide some details (screen recording, whether or not it happens on all of your files or just one, details of your OS). If you provide responses to questions like that, it will be easier to figure out what might be going wrong, and therefore it'd be easier to help you resolve your issue.

I work with Urdu fairly regularly, but one thing I've never done is start an Urdu file in one verison and then open it up in a subsequent version. When the developers work on InDesign, they sometimes make changes to the text rendering engine. So if you make an Urdu file in version 18, then open it up in version 19, then your text is still being rendered according to the rules in version 18, until you make a change to the text. At that point, the whole thing re-renders according to the rules in version 19. That sounds exactly like what you're experiencing, right?

So, there are some things to try:

1) Do you still have version 18.5 installed? You could start the old version, open up your old .indd file saved from 18.5, then export IDML, and try to open that IDML in version 19. 

2) You could try to recompose the whole document.  This will probably just induce the spacing error in every story in the document, but it's worth taking a look. Once you have your document open in verison 19, you can use the key combination Control + Alt + / (assuming you're using Windows; on a Mac it's Command + Option + slash). 

3) You can experiment with the Justification dialog (Windows shortcut is Control + Alt + Shift + J) to see if the settings you have there are behaving differently in the v19 text rendering engine.

3b) I can see you have Kerning set to Metrics; you can try selecting some problematic text and setting that to None. It's possible that the metrics in the font that you're using are being handled differently in v19, and this is one way to check. 

4) You can post your v18.5 file here and ask us to download it and see if we can recreate your issue on our own desktops; that might lead to a solution for you, or to a bunch of people ready to file a bug report.

That's what I have on the top of my head. I have had my own frustrations in the last few years with the rate at which the InDesign developers fix showstopper bugs in complex script and right-to-left layout tools, but your claim that "nobody listens in Adobe for RTL language issues" just isn't true. They've fixed... half the bug reports I've made regarding layout issues in RTL languages? Not bad, I guess. But in order to get things fixed, when there are bugs, you'd need to be very rigorous in your bug report, and just saying "it doesn't work" won't work. So, if you can, please provide some more details, and also if possible provide a packaged sample file here, so we can try to recreate your issue.