Game fails to load NPCs

Hello there!

Some time ago I experienced the Lost Isles bug, which took me there and set my Heartstone to the Warchief's Overlook (on the Lost Isles). I play a mage so it was not a problem to get out. And because I use only portals for travel, I forgot to change my Heartstone's location.

Then, a few days ago, I got stuck on the Isle of Thunder after arriving there (didn't know it was not complete). So I logged here and used the 'unstuck' feature to get my character out of the Isle. And it took me to the Lost Isles. Again, I teleported out, but this time, there were almost no NPCs anywhere.

I visited the Shrine in Pandaria and it was completely empty (no players, NPCs or interactable objects). I went to the enemy faction's Shrine and it was empty as well. I could move around freely and without any problems (the same applies to any other supposedly hostile places).

At first, it was fun, I could visit all the places I normally couldn't on this character, but now I grew very tired of this. There is nothing I can do in this game besides exploring, which honestly started to be boring. There are neither any quest givers, nor vendors, nor flight masters, nor actioneers, bankers, inkeepers and the like.
The only place I can see other players as well as NPCs and objects is Orgrimmar but as soon as I leave its gates everything disappears.

I don't know what to do in this situation and I would really appreciate some help.
Thanks in advance.

I have the same problem. I came to the Isle of Thunder, got stuck, used the unstuck function on the web. Then got teleported to the HS location (trade district), since then I can't see any npc's or players outside of Stormwind

Edit: Signing up for a dungeon seems to have helped solve the issue. I was teleported to the Scarlet Monastery and after finishing the dungeon the problem persisted but not long ago I went there alone through the entrance in Tirisfal Glades and after I got out, everything reappeared.