I had a similar problem, even after exploding blocks, purging and deleting all blocks in blockmanager, the reference layers remained. However when i closed and reopened the file all the empty ‘undeletable’ referenced layers were gone!
I had a similar problem, even after exploding blocks, purging and deleting all blocks in blockmanager, the reference layers remained. However when i closed and reopened the file all the empty ‘undeletable’ referenced layers were gone!