WowAce

In the past the maximum number of boss frames allowed from Blizz's side was 5.

At some point this was increased to at least 8 (not sure on the specifics)

Within SUF there's no way to force it to show more than 5 boss frames on encounters that allow this, whereas other UI addons have been updated to make use of the additional frames.

Example:

Mythic Dimensius has 6 adds spawn plus himself on pull as boss1 - boss7 and all these frames are visible as boss frames in ElvUI, but SUF is only showing 5 frames (same problem on Forgemaster Araz which has 6 boss frames available in intermission and SUF only shows 5)

I found a 3 year old addon (https://github.com/GabeStah/kExtraBossFrames) that addresses this issue but it throws out error messages and I'm not knowledgeable enough to make the edits or fixes myself so praying this gets looked at.