Hidey ho! The Houdini 20.5 Production Build has been updated to 20.5.550.

Here's a link to the journal for all the changes that went in since 20.5.522:
https://www.sidefx.com/changelog/?journal=20.5&categories=&body=&version=20.5&build_0=522&build_1=5550&show_versions=on&show_compatibility=on&items_per_page= [www.sidefx.com]

Also, the QT6 version is now gold. (optional download. The default is still QT5)