After migrating a UEFN project, World Partition streaming fails to unload cells, causing a memory spike

After migrating my UEFN project, memory spikes from 97k to 141k because World Partition streaming fails to unload cells. I’ve tried:

Re-enabling streaming and rebuilding the minimap.

Altering Cell Size to in World Settings to attempt a reset, then reopening UEFN.

‘Convert Level’ option is also missing

The issue persists across all islands tested. Is there any current work around to this issue?