Game breaking : In multiplayer in the delve mine, the "secondary player" can't exit the mine

In multiplayer in the delve mine, the "secondary player" can't exit the mine at the end of a node. The player who doesn't own the node has to leave the game and relog. The player can't interact with the node, can't make a TP and can't teleport to the player owning the mine.

There are many bugs in multiplayer in the delve mine for the secondary (many issued preventing the secondary player to enter the mine instance of the main player or even being disconnected by using the portal spawned to enter it). But this new bug makes delve mine in multiplayer unplayable.

I have the same issue(s). It is very annoying if you just want to go to the mine encampment after a node to restock on flares and/or dynamite. I can't even click the crawler to see the map. (league interface opens a small snippet of the map but there's no possibility to interact and no button to return to the mine encampment or whatever)

Why has this been disabled?