We're happy to announce that the fix for this issue is now available in the latest update of InDesign - version 17.2 that is available to download from Creative Cloud Desktop application.
Please update to this latest InDesign version to get the fix.
Adobe InDesign team
An error occurred while saving the commentBarbara Walls commented
Jessie Kendall-Merks: THANK YOU! This solved my disappearing text issue. I selected all the frames on the page, changed the frame from none to Registration, then back to none. The text reappeared. The frames with a fill did not correct themselves, but that is far easier to redo than rebuilding an approved ad!