Inspect Tile Source: world_cities shows blank map in UI; unclear if I am doing something wrong

[C-Loftus]

Thank you for the excellent work on martin. I ran the quickstart and it shows up fine in qgis but nothing appears in the browser ui's visual inspect tab. I am wondering if this is a bug, I am doing something wrong, or if it is just not implemented yet. I am using the test data from the quickstart.

I have tried both with a sample osm style json and no style json. I see no issues in the browser console, error logs, nor 400 status codes in the browser network tab.

host@host ~/g/martinTest> ./martin --webui enable-for-all world_cities.mbtiles --style .
2026-04-17T18:01:31.126376Z  INFO martin: Starting Martin v1.5.0
2026-04-17T18:01:31.126432Z  INFO martin: Config file is not specified, auto-detecting sources
2026-04-17T18:01:31.126699Z  INFO martin::config::file::cache: Initializing PMTiles directory cache with maximum size 128 MB
2026-04-17T18:01:31.126795Z  INFO martin::config::file::file_config: Configured source world_cities from /home/host/github/martinTest/world_cities.mbtiles
2026-04-17T18:01:31.130703Z  INFO martin::config::file::cache: Initializing tile cache with maximum size 256 MB
2026-04-17T18:01:31.130744Z  INFO martin::config::file::cache: Initializing sprite cache with maximum size 64 MB
2026-04-17T18:01:31.130770Z  INFO martin::config::file::cache: Initializing font cache with maximum size 64 MB
2026-04-17T18:01:31.130949Z  INFO martin_core::resources::styles: Configured style source osm_liberty to ./osm_liberty.json
2026-04-17T18:01:31.130973Z  INFO martin: Use --save-config to save or print Martin configuration.
2026-04-17T18:01:31.131478Z  INFO martin::config::file::cors: CORS enabled with defaults: CorsProperties { origin: ["*"], max_age: None, unrecognized: {} }
2026-04-17T18:01:31.131974Z  INFO martin: Martin server is now active at http://0.0.0.0:3000/