A THREAD FOR NEWCOMERS!

The question is: is this a generation bug, or one of the possible map generation variations?

This is not a bug. It's just that the area where the white teleport to the computer is located also turned out to be snowy, so it seems like it's all one zone. The lone archers (next to the wolves) in the second screenshot confirm this. There was another guard standing somewhere near the mill, who was killed.

Added 12 minutes later

If it's a bug, and something like this is found in a tournament game, is a mandatory restart given, or is another decision made?

If something unclear happens in the game, you can always ask the judge for clarification. Usually, technical restarts on HL+U are given in cases:
1. One of the computers is missing.
2. One of the respawn points is underwater.
3. The monolith turned out to be 4-sided instead of 2-sided. (To avoid restarts due to encounters and save time)
4. Obviously buggy passages that will lead to a restart due to an encounter (for example, the red passage to the green computer).

However, buggy passages are not a reason for a restart. If it turns out that you have a buggy passage, for example, to the pink computer, then use it and be happy.