Using pedestrian navigation on imported maps

Hi, everyone!
I have created and exported a custom map with RoadRunner following the “How to add a map” tutorial in the CARLA documentation. After going through the instructions for importing the map to CARLA 0.9.11 built from source, including generating the navigation binary, I unfortunately can’t use the pedestrian navigation.

I tried the included “spawn_npc.py” script, but it only spawns vehicles. When I built a custom, minimal example that forces a pedestrian to spawn, my script crashed with a segmentation fault as soon as I applied the WalkerControl.
As a side note, I can’t build the Python API for Python 2.7. This is not a big issue for me, as the API for 3.6 was built just fine, but could these issues be related?

Thank you for your advice!