I’ve found some behaviour that may not be related to this version but thought I’d mention it:
When using the duplicate manager to create a copy of an image, any hidden grouped images are unhidden (e,g, the JPEG version of the raw), even if you have the “collapse grouped images” enabled. Then if you delete one of the duplicates using duplicate manager, grouped images remain visible until you disable then enable the “collapse grouped images” toggle again.
If you delete the original instance of the RAW file, to keep just the new duplicate, then disable/enable the “collapse grouped images” toggle, the JPEG becomes the master file that remains visible, and the RAW gets hidden.
I feel the intended behaviour should be that the RAW is always considered the master file, even if it’s a duplicate, and the JPEG should always be hidden if you enable this toggle.