Value of an isolated passed pawn in endgame ?

[Henk]

And cloning.

[Henk]

Might be that if King is on first row and there are no protecting pawns then game is lost when Rook, Bishop and Knight are all active and able to threaten check mates.

[Daniel Anulliero]

And cloning.

Of course
And listening ( advices of more talented)
Posting (real position instead of some aproximation)
Saving (some pgn you can replay and analyse)

[Henk]

Advices only work for their own engines unless you have created a proper standard clone.

[Lyudmil Tsvetkov]

Just played a blitz game with Queen + three extra isolated passed pawns on row four and three against Rook, Knight and Bishop. Both having some other pawns.

But Skipper playing with the queen was loosing this endgame quickly though evaluation value said +2

It is indeed +2, but for the non-queen side.

SF imbalance evaluation is awful, I do not know if they can make it even worse, but that is to be expected, when they are multiplying God knows what array values by God knows what coefficients.

Komodo imbalance eval is somewhat better than SF, partially much better for specific positions, but overall also very far from satisfactory.
I do not mention other engines.