Debian 12: tilemaker-server no longer serves tiles

[HaukeDE]

Hi all,

could use some help: I use tilemaker on Debian 12, where it nicely is available as an OS package (apt install tilemaker). I have successfully created mbtiles-DB's with that and used them in conjunction with tilemaker-server and maplibre to create and fine-tune my style-JSON-files. This was in August last year, and now it was time to do some style overhauls. I fired up tilemaker-server again, but now it is no longer willing to serve any responses to
http://localhost:8080/{z}/{x}/{y}.pbf

Static content is served, so e.g.
http://localhost:8080/index.html
yields a valid answer.

The PBF query is accepted, but then times out. If I stop tilemaker-server, the request is no longer accepted, but rejected - so the server is doing something.

Except for the regular system updates, nothing has changed regarding my setup.

Can anyone point me on ways to gather troubleshooting information, or even better, a hint for a solution?

Thanks all!

Hauke