update - I got rid of that particular error and stopped the error screens by removing the component that was referencing RecordFixtureData.commentCount (duh). not sure why that messed it up though, and it still gets stuck on the loading screen for 3 out of 4 attempts to load it full screen :person_shrugging:
update - it seems to be happening again even after I removed the aforementioned component :person_shrugging: :person_shrugging:
solution - Airtable support had be update the Blocks SDK to 1.10.2 and it solved this issue :slightly_smiling_face: