As I cannot replicate this or it's potentially expected per my prior reply with network shares & items not already pre-cached into the local library then all I can I do is add what was internally obtained as the length & report that as part of the error message to try to diagnose it.
Alternatively for now you can trying checking the option on the scrobbler page to allow shorter durations to be sent & assuming network shares are still involved, go to preferences -> advanced -> options page 2 -> un-check the network file path checking option on there.
Also apply the post-release updates if not already done as the about|updates page showed there ones pending being applied.