In Japan Region, it happens while peak time in Japan (about 8-12 p.m. JST) but it doesn't happen in other regions at the same time. Probabily server overload or taking DDoS attacks.

In the Japan region, symptoms occur during peak hours in Japan (around 8-12 p.m. JST), but they did not occur at other times. It seems like the server is overloaded or under DDoS attack.

this literally happens to me 50% of the time I try and load into a world. makes the game not worth playing a lot of the time - not gonna lie have rage quit a couple times

Same here, emailed the support team earlier this week, their response:

same issue

Here is my log file from the moment I joined one of the broken world instances: https://pastebin.com/eBYF3Uix

We can reproduce this issue when needed. When certain users create an instance of our world, that instance is permanently broken for everyone joining after them.

We can easily reproduce this issue on some instances, not all. The player is then loaded in a giant black sphere far outside the world spawn (which would be 0,0,0 in our world). Post processing, Udon etc. is never initialized. You can't see/open the menu. Opening the menu teleports you back into the sphere. I asked a user with mods to use noclip to fly outside and they managed to get away from the phere and into the world after an extreme far travel. You can always see that black sphere in the distance.

From what i could get from the LOG this part stood out in the end right after attempting to join another public instance:

2020.11.23 00:18:53 Log - [VRCFlowManagerVRC] Waiting for players to have network data

2020.11.23 00:18:53 Log - [Always] Memory Usage: after world loaded [wrld_741d3d28-76e9-4644-b83e-df14da005499]

2020.11.23 00:18:53 Log - [VRCFlowManagerVRC] Finished entering world.

2020.11.23 00:18:53 Error - [API] [4190, 401, Get, 2] Request Finished with Error!

No Exception

{{"error":{{"message":"\"Missing Credentials\"","status_code":401}}}}