Here’s the official release note:
From Plex Media Server - #487 by gbooker02
Plex Media Server 1.25.6.5545 is now available to Plex Pass users in the Beta update channel.
NEW:
- …
- (Stream Metadata) Provide additional detail in display titles for HDR streams (#12492)
I suppose that means one more suggestion to check off Plex’ list 
