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I originally logged the bug with the sample which was easy to reproduce, literally the most basic cloth example add cloth to a plane in the newest official release. I had tapestries in a castle before 2019.2 with cloth working beautifully and after I updated to 2019.2 all the tapestries went crazy and flew straight up or balled up into what looked like a black hole a combination of whatever external forces I had programmed to give the tapestries a look of airflow down a passageway with whatever odd external force applies randomly to the cloth without any adjustment by myself. According to the bug status they have fixed it in 2020.1 and are working to fix it for the latest 2019 version alpha/beta and release. Crossing my fingers on the next official release update having it fixed. It could be something funky with whatever code segment handles gravity as an external force and that is causing the odd and seemingly random movement of the cloth, which is why people keep referring to the gravity system but whatever the case I'm hoping its thoroughly tested as they are doing updates to make the cloth system better as part of 2019.

They answered me in a letter, they wrote that the problem is only in gravity, but this is not so.
https://www.youtube.com/watch?v=-h8zjKjpJKY

https://forum.unity.com/threads/cloth-acceleration-not-working.725240/

looks like people are facing this issue in 2019.2. please fix!

I uploaded a video demonstrating the severity of the issue with default cloth settings on a single plane. Gravity works as intended while the plane is in the initial rotation, but doesn't work once the plane is rotated.

https://youtu.be/lpXLKrjBFYo

There is a problem and it is much wider than indicated.
https://www.youtube.com/watch?v=F6sxXA3GCVQ

Try to reset rotation or set cloth.useGravity = false . The problem is related to cloth gravity.

Is there another way to fix this issue earlier as 2020?

I'd love to have it really functional at least you said so - back in april https://youtu.be/qwGjneorKgs?t=3067