Very few engines can handle fortress assesment correctly, as already pointed out by other members here.
below position was shown by an IM who posted this in youtube
[d]8/7K/1R6/k2p3b/Ppp5/1p1P4/1PP5/8 w - - 0 1
Most engines got the correct line: Rb5+ Kxa4 Rxb4+ Kxb4 c3+ Kc5 d4+ Kd6 Kh6 Ke6 Kg5
but gives the wrong assesment and shows black is winning because of +2.00 or greater than +3.00 in eval score. But it's a fortress draw.
Also, below position is another fortress from one of his actual blitz games that was analyzed in youtube against a GM.
This was a fortress draw and was missed by a GM who didn't hold the losing side.
[d]8/2k2p2/p3p1p1/Pp2P1Pp/1P2P3/4K1P1/8/5b2 w - - 0 1
Test Position - wrong eval score
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Test Position - wrong eval score
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