iOS part of tableview goes black when orientation changes

When I change tableview orientation , part of the screen goes blank at the bottom.

Steps to reproduce:

• Have tableview in a view controller
• Push a new viewcontroller during an action
• Rotate the screen from Portrait landscape.
• Press back button to pop the current viewcontroller
• Now rotate the view controller from landscape to portrait.

The bottom part of tableview goes black.

I couldn't reproduce this always but I was able to reproduce this twice in 50 attempts.

FYI:

My Viewcontroller has only tableview that's all and all cells has autolayout constraints. Trying to understand why it happened and I would like to fix it.

I am able to get the issue 6 out of 10 attempts in iOS 12.4 ipad air 2019

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Update:

Please find the images below

(Portrait screenshot. I morphed it with purple color for privacy. The dark color is the bug that I'm talking about)

(Landscape screenshot. I morphed it with purple color for privacy. The dark color is the bug that I'm talking about)

from iOS part of tableview goes black when orientation changes