Version 15.5 of the Studio Display software has been available for a few weeks, but Apple today released a new build numbered 19F80. The group is taking on a problem that we reported on earlier this week. Specifically, the various audio errors are fixed.
Studio Display Software 15.5 19F80 ist da
Otherwise, Apple has not fixed any errors, at least according to the appropriate support document. The update is carried out directly via the connected Mac, here you need at least software version macOS Monterey 12.4.
Via Apple Support