Heal prediction doesn't work in dungeon party or raid

[ActorSir]

Description
Heal prediction works great in a normal group, but when you enter a dungeon, it stops working in group frames as well as player and target frames.

Steps to Reproduce

Enable Heal Prediction in Party, Raid, Player and Target frames;
Find dungeon via Dungeon Finder;
Enter the dungeons and check
Expected Behavior

Heal prediction should also work in dungeons

Actual Behavior

Not displayed

Only ElvUI Enabled
The error appears even if turn off all another addons

Blizzard Issue?
No

Error Log
No errors, no warnings.