[Bug?] Black is too willing to agree to a draw

[neongreen]

golden-games/1515dfc7-4ed7-444d-a8cb-ac6b35e699bd/depth-4.txt:

19. Ke1 -8.91
... Qf2 -7.11
20. Kd2 -7.11
... Qe3 -7.11
21. Ke1 -7.11
... Qf2 -7.11
22. Kd2 0.00
1/2-1/2 0.00

Black is unencumbered here. Why does he make a move that allows a draw? Alternatively, why is eval for 21... determined to be -7.11? At depth=4 it should see that white can draw on the next move.

[neongreen]

Okay, 22. Kd2 0.00 is actually probably just a bug, but still I don't know why black does Qf2 at depth 4.