Can you export your Elements (that haven’t been re-saved since import) and share the
.xml file with me so I can import them on my development site and run some tests.
Something is becoming corrupt during import so the Display Rules aren’t loading. Then, when you save the Element, you’re overwriting the old corrupt data with empty Display Rules which is why the Elements no longer appear.
However, the fact they appear on the frontend after initial import means the data is there, something just isn’t working when loading the Element in the dashboard.
If I can get a hold of those specific Elements I should be able to pinpoint the issue.
Let me know 🙂