When a map is being loaded in Multiplayer, it seems like the map is not being shown at all.
It will only appear correctly at the very end of the progress bar.
Is it a workshop map or a launch map?
Some of the workshop maps have loading screens that aren’t implemented in game (yet) this is just a bug from that.
Sorry for the late response, I have been trying as many map as I could and it seems to happen mostly on workshop maps, indeed.
Then it’s definitely an issue with the workshop maps having loading screens when they shouldn’t.
You’ll see this feature pop up soon 