I'm trying to make a prefab of a vanilla house that has less furniture than normal to improve performance. I don't want to get rid of all furniture because that would include the lights, no light no see. Another user showed me his method for removing furniture and im trying to replicate it but i keep crashing when i delete a piece of furniture.

His method described placing the house in the world, for this example its 'House_Village_E_1L02t.et' duplicated to my project from the prefabs folder.
Breaking the prefab on the instance.
Breaking the prefab on the furniture entity
Breaking the prefab on the 'buildingfurniture_base' prefab
Delete objects you don't want
Drag and drop the object into resource browser making a new prefab.

I crash when i try deleting any objects at step 5.

I hope i am just doing this wrong and there is an easy way to do it. I would greatly appreciate being corrected or an update to fix.