Thank you for the code demo. So, for the first issue you reported, that’s a current limitation as pagination isn’t support natively a custom implementation of this feature results in incompatibility with some of the plugins, mainly filtering, as in your case.
For the second issue, I’m not sure if I can reproduce it correctly. I uncommented the mentioned line but I don’t see much difference in the table. Can you please provide the steps how to check the problem and/or some screenshots before/after the change and the expected result?