Double WP data conflict

Good morning, I want to ask about one bug, that I find with new 5.1.1

Problem Part:

  1. we have a “open world” level (L) using World Partition (WP)
  2. we are using level instances (LI) for smaller locations there
  3. after update to 5.1.1 LI are generating WP data when created
    (in some cases WP data are generated even on old LI)
  4. opening L using WP with LI using own WP data leads to crash
    (I’m considering that L using WP can not have LI using WP inside - leading to “double WP data conflict”)

Workaround Part:
5) once we are not able open L we have to backup and delete original LI to break references
6) after this procedure there is possible to open L, but without LI (which was deleted)
7) only way to bring LI back to level is to find old LI without WP, duplicate and replace all objects in there, or create new level instance in NON WP level

I’m not sure if this new LI with WP data is some new approach, but it leads to this crash situation.
If you have some suggestion how to avoid this “double WP data conflict” it will be very helpful for us.