A project for cello and harp was playing back perfectly until this morning. Now every third or fourth note sounds. I have the playback template set to HSSE+ HSO Pro. I am running Dorico 4 on Windows 11.
Literally. After restarting Dorico 4 several times (and then writing to the Forum) I installed 2022-11 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5020044).
And after restarting Dorico it seems that the playback is working properly.