Boss enemy causing Softlocks, thus loss of a Waystone.

I ran a Tier 15 Waystone on a Forest Boss-Map.

The Boss happened to be one of the first enemies I encountered so I cleared him, as one does.

For some reason entering that fight brought up an Arena Wall which refused to fade away after the boss was already killed.

Reentering the Area, Picking up all items, Relaunching the game, all did not fix this issue. Especially since relaunching the game closes the Portals to that area.

A soft-fix for this is obviously clearing Map-Boss as the very last mob. Still, this shouldn't be happening.

https://imgur.com/a/9A9uFZn Evidence Picture.