The main setup is Drupal Panopoly distribution and using MongoDB Field Storage module. I encountered issue in Panels' in-place editor where after saving the non-reusable Text Fieldable Panels Panes
... it displayed empty body:
This started to happen after updating to Panopoly version 7.x-1.37 (2016-06-16).
After spending hours of debugging, I discovered that the MongoDB Field Storage is not yet aware of using revision ID for non-reusable FPPs. To fix this issue, go to
... and select "Legacy: Use entity ID for all FPPs."
Update your Text Fieldable Panels Panes and its body should now displaying: