I'm failing to import a PDN into my study:
toernooibase.kndb.nl/applet/applet1pdn.php?kl=23&Id=7153&r=1&jr=0&wed=1080559&Teui=&taal=1

Thank you for reporting, I will look into it!

I can reproduce this only in studies, it seems the other import functions do understand the PDN:

It works fine if you paste it in the PDN field at lidraughts.org/analysis

The game can also be imported from lidraughts.org/paste

It has been fixed, the game imports fine now in studies as well