I labeled this as a bug but I’m not sure. Whenever I add a resource pack in the server.properties file, when the server restarts or turns on, the url has an extra slash ad ded and the resource pack does not work.
Original
https://download.mc-packs.net/pack/639aecb501590d6cc73da15461888325db1b0699.zip
Changed
https\://download.mc-packs.net/pack/639aecb501590d6cc73da15461888325db1b0699.zip