[Xrystal]

Yeah, sounds like the, not with you , scenario. But that should be covered by the phasing code if the grid2 developer used the code that was in blizzard's code.

I do notice on the grid2 frames a single dot on each one. What does that represent ?

Aha. Found the phasing code in grid2 .. Windows search subfolders apparently didn't work rofl.

This block of blizzard code appears to include 2 events that grid2 isn't checking for in their phasing code module.
https://github.com/Gethe/wow-ui-sour...Frame.lua#L393

elseif ( event == "UNIT_PHASE" or event == "PARTY_MEMBER_ENABLE" or event == "PARTY_MEMBER_DISABLE" or event == "UNIT_FLAGS") then
        if ( event ~= "UNIT_PHASE" or arg1 == unit ) then
            PartyMemberFrame_UpdateNotPresentIcon(self);
        end
    elseif ( event == "UNIT_OTHER_PARTY_CHANGED" and arg1 == unit ) then
        PartyMemberFrame_UpdateNotPresentIcon(self);

PARTY_MEMBER_DISABLE fires when the other person is dead or offline. So, maybe they were dead when that showed up on them for you.
PARTY_MEMBER_ENABLE may kick in when they come back alive, but wkigg shows it triggers to show whether still online online

You can check if these are the factors that make a difference by adding the events to the StatusPhased file in the OnEnable function, both events return the unitID like the other events do.