Asset Picker / Link Field shows Node-IDs, not folders

Expected:
After picking a Celum asset, the human-readable folder path is displayed in the link field in the dialog (e.g., /documents/misc/asset.pdf)

Actual:
After picking a Celum asset, the node-id path is displayed (e.g., /13021/1928/392)

Log shows this:
2022-05-02 18:05:45,931 INFO  info.magnolia.external.dam.celum.CelumAsset       : Cannot connect to content source Connection refused: connect

This was fixed previously by Teresa, but stopped working again around version 1.00 of the connector.