pretty strange, using the exact markdown from your attached export, it works fine here:
2025-05-05.pdf (21.9 KB)
2025-05-05.md (151 Bytes)
This is on a windows device though
actually, appears I can re-create it if I use print to PDF instead of the direct pdf export.
The pdf from my previous reply was exported by right clicking note | export | pdf
this pdf is using file | print | print to PDF and the links aren't clickable:
test.pdf (11.7 KB)
What platform are you running Joplin on? A flavor of Linux? Or something else? It's interesting that using one path to PDF, it succeeds for you and not via the other, and that it fails for both paths for me.
Windows in my case
Can you share your "about info." Maybe this is a plugin-generated anomaly.