Can't go through the door and onto the bridge

When I try to play the Highway 17 map d2_coast_07, Gmod messes up. When I go through the door and out onto the bridge Gmod either reloads over and over or loads d2_coast_08. Happens the same with a cleam garrysmod folder.

This map works fine in the updated HL2 and in Smod Redux8. In vanilla SMOD I get stuck in the door and have to noclip for a second to step out of it.
Anyone else have this problem?
Anyone have a fix?