Thank you for reporting the issue to us.
We have fixed the issue in the latest version of InDesign, Id 14.0.3
Please upgrade your InDesign application to the latest version to try out the fix.
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You may also follow the below given link for the list of all fixed issues in Id 14.0.3
https://helpx.adobe.com/indesign/kb/fixed-issues.htmlRoy Behymer commented
This also happens on Macs. ID 14.0.2, Mac OS 10.14.3. I've reverted to ID 2018 until this is fixed.
12 votesRoy Behymer commented
Is there a reason it has to be a header, yet not behave as a header by repeating at the head of frames/pages/etc.? If it's only to be on the first page, there's no reason I know to have InDesign treat it as a header. It sounds like it is a body row, just with special formatting to distinguish it from the actual table body.
Am I missing something?