There is no map in Chrome v140
... But it loads OK in r3dfox-140.0.4:
so this isn't, probably, a site issue ... Do note that this service embeds "maps" from the
https://openmaptiles.org/
https://www.openstreetmap.org
projects and for the maps to display correctly in a browser, it has to have WebGL (1 or 2) support enabled (and I remember from his 360EE days that NHTPG has a tendency to disable WebGL in his browsers ) ...
If your NM28/St52 copy has WebGL support enabled (check in about:support -> graphics), then the most probable reason the Krakow map doesn't load is UXP's Javascript-related shortcomings ; in a slightly older (not current) NM28 build, BrowserConsole reports a TypeError: