Blight monster emerges at end but can't be killed prevents completion

I have done alot of blight in regular maps with the new salvage mechanism which I like alot, but this league as well as last but to a lesser extent there is sometimes one last blight monster that emerges but doesn't move and cannot be killed by the towers or my character and prevents the completion of the blight. I can collect from the blight pustules but all the effort in building towers to full to salvage is completely lost and very frustrating.

I know I cannot be the only one experiencing this and again, this also happened last league as well but seemingly to a lesser extent and I didn't report it.

That along with the crashes and flickering which I know GGG is working on makes it alot less fun to do.

Thank you for the patches GGG. This is an old one from last league and perhaps prior. let's nip this in the bud.

I have the same kind of issue.

Today i had one of the blight portal that spawned on a petrified amber tree : mobs that spawned on this portal are stuck in the tree, not targetable by towers or by my attacks, so the blight encounter cannot end.

Bug Report ID: #1556896074