By default it does refresh upon server save as well, although you can close the server without refresh.
The reason why it looks like this is because the shape of refresh on the east side follows the old coastline. They simply forgot to correct it after adding the bridge in later version. Refresh tiles in many places can tell us a lot about the history. E.g. if you look at the bear room, you can see where the cave with the key was located originally, and you can also notice that the corridor used to be more narrow. Additionally, those two non-refresh squares in the room were probably the original location of the quest chests - they later moved them to create the sewers gate for emergency exit to prevent players from getting trapped inside.
There are many such remains all over the map from which we can learn about the past. You can even tell the exact shape and location of the ancient daemon spawn in Mintwalin just by the refresh tiles. It's all because mappers simply didn't always remember to correct refresh tiles when making changes to the map.
Btw, thanks to
@kor you can view the map with refresh zones here:
Tibiantis Info - 7.7 Map (https://tibiantis.info/library/map/tibiantis#32138,32109,11,8) Just remember to mark "refreshable tiles" on the right, and unmark "tibiantis map" if you only want to see the original 7.7 cip map.