Fix for this issue is now available in the latest update of InDesign 2020.
In the Creative Cloud Desktop application, click on the Updates section on the left. You should be able to see the Update available for InDesign. Please update your InDesign application to this version to try out the fix.
Let us know in the comments section if you face any problem with the updation process.
Adobe InDesign Teamkbevando supported this idea ·kbevando commented
When I have text in a table cell, CMD-Arrow keys are not working. I usually use CMD-Arrow to move around between paragraphs and words. It works fine outside of table cells, but not inside. It is however working fine inside table cells when I hold the shift key to select text, but not without the shift key, to just navigate my cursor between words and paragraphs. Please look into this bug and fix it for a future update. It's driving me crazy.