I am aware many players have reported this bug since a long time now.
But what I’ve found today, I haven’t heard about yet.
So I come here to describe what happened to me so maybe it could help the devs.
After exiting the game just before doing the last quest of the 2nd monolith (lvl62), I resumed my progress and wanted to finish the last one. But when I clicked, the loading screen wouldn’t finish, even after 10 minutes or so.
Usually it takes seconds, so I thought it was a bug. I tried to press various keys, and the “del” key that is supposed to hide HUD just hid the loading screen itself. I was still on the platform, i could interact with the monolith, and was able to enter another node, tp out, and then I was able to load the last mission.
I hope this info will be useful.