Engine sometimes accepts draws in winning position

[QueensGambit]

This seems to be related to the fact that terminal nodes can be visited more often.

Example game:

[Event "My Tournament"]
[Site "?"]
[Date "2021.04.18"]
[Round "9"]
[White "ClassicAra 0.9.1 - TB"]
[Black "ClassicAra 0.9.0"]
[Result "1/2-1/2"]
[ECO "B90"]
[GameDuration "00:00:29"]
[GameEndTime "2021-04-18T01:50:38.425 CEST"]
[GameStartTime "2021-04-18T01:50:09.327 CEST"]
[Opening "Sicilian"]
[PlyCount "146"]
[TimeControl "10+0.1"]
[Variation "Najdorf, Byrne (English) attack"]

1. e4 {book} c5 {book} 2. Nf3 {book} d6 {book} 3. d4 {book} cxd4 {book}
4. Nxd4 {book} Nf6 {book} 5. Nc3 {book} a6 {book} 6. Be3 {book} e5 {book}
7. Nb3 {book} Be6 {book} 8. f3 {book} Be7 {book} 9. Qd2 {book} h5 {book}
10. O-O-O {book} Nbd7 {book} 11. Kb1 {-0.03/21 0.36s} Rc8 {+0.16/22 0.36s}
12. Nd5 {-0.06/22 0.37s} Nxd5 {+0.17/24 0.37s} 13. exd5 {-0.20/22 0.37s}
Bf5 {+0.19/24 0.37s} 14. Bd3 {-0.15/22 0.37s} Bxd3 {+0.17/19 0.37s}
15. Qxd3 {-0.11/20 0.38s} Bg5 {+0.18/20 0.37s} 16. Bf2 {-0.05/23 0.38s}
O-O {+0.08/22 0.38s} 17. h4 {0.00/23 0.38s} Bf4 {+0.12/22 0.39s}
18. g3 {-0.05/24 0.38s} Bh6 {+0.09/23 0.38s} 19. g4 {+0.02/19 0.38s}
Bf4 {+0.14/20 0.38s} 20. gxh5 {+0.07/20 0.38s} Nf6 {-0.03/19 0.39s}
21. Rhg1 {+0.17/19 0.39s} Qd7 {-0.03/18 0.39s} 22. Nd2 {+0.19/21 0.39s}
Nxh5 {-0.08/20 0.39s} 23. Ne4 {+0.11/19 0.39s} f5 {-0.06/19 0.39s}
24. Ng5 {+0.16/27 0.40s} Bxg5 {-0.12/29 0.40s} 25. Rxg5 {+0.16/29 0.40s}
Nf4 {-0.19/23 0.40s} 26. Qd2 {+0.28/23 0.40s} Rf6 {-0.32/24 0.40s}
27. Be3 {+0.46/23 0.40s} Nh3 {-0.49/22 0.41s} 28. Rg2 {+0.56/20 0.41s}
f4 {-0.65/20 0.41s} 29. Bb6 {+0.64/19 0.42s} e4 {-0.46/26 0.42s}
30. fxe4 {+0.79/17 0.42s} f3 {-0.88/28 0.42s} 31. Rg3 {+0.86/27 0.24s}
f2 {-1.00/25 0.23s} 32. Qd3 {+1.37/30 0.23s} Nf4 {-1.33/26 0.23s}
33. Qf1 {+1.37/25 0.22s} Qa4 {-1.25/23 0.22s} 34. Qxf2 {+1.33/30 0.22s}
Nh5 {-1.05/29 0.22s} 35. b3 {+1.18/28 0.21s} Rxf2 {-0.91/27 0.21s}
36. bxa4 {+0.95/26 0.20s} Nxg3 {-0.79/25 0.20s} 37. Bxf2 {+0.81/24 0.20s}
Nxe4 {-0.78/27 0.20s} 38. Be1 {+0.85/26 0.19s} Rc4 {-0.77/26 0.20s}
39. a5 {+0.87/27 0.19s} Nc3+ {-0.81/25 0.19s} 40. Bxc3 {+0.85/26 0.18s}
Rxc3 {-0.91/22 0.18s} 41. Rd4 {+1.07/21 0.18s} Rc5 {-1.02/25 0.18s}
42. Rb4 {+1.17/25 0.18s} Rxa5 {-1.10/23 0.17s} 43. Kb2 {+1.25/23 0.17s}
Rxd5 {-1.13/21 0.17s} 44. Rxb7 {+1.20/20 0.17s} Rh5 {-1.09/19 0.17s}
45. Ra7 {+1.24/21 0.17s} Rxh4 {-1.08/21 0.17s} 46. Rxa6 {+1.20/20 0.17s}
Rd4 {-1.00/20 0.16s} 47. Kc3 {+1.13/20 0.16s} Rd5 {-0.96/19 0.16s}
48. Kc4 {+1.00/15 0.16s} Rc5+ {-0.75/14 0.16s} 49. Kb3 {+0.94/13 0.15s}
Rb5+ {-0.80/16 0.15s} 50. Kc3 {+0.75/11 0.15s} Rc5+ {-0.56/10 0.15s}
51. Kb3 {+0.71/13 0.15s} Rb5+ {-0.84/18 0.15s} 52. Ka4 {+1.01/17 0.14s}
Rb2 {-1.10/17 0.14s} 53. Rxd6 {+1.09/19 0.14s} Rxa2+ {-1.05/20 0.14s}
54. Kb3 {+0.83/19 0.14s} Ra8 {-0.95/21 0.14s} 55. c4 {+0.68/19 0.14s}
Kf7 {-0.64/17 0.14s} 56. c5 {+0.59/16 0.14s} g5 {-0.58/22 0.14s}
57. Rd1 {+1.18/17 0.14s} Rg8 {-0.88/23 0.14s} 58. Kb4 {+2.47/19 0.14s}
g4 {-1.11/22 0.13s} 59. c6 {+1.94/23 0.13s} g3 {-1.06/23 0.13s}
60. Ka5 {+1.82/19 0.13s} g2 {-1.05/20 0.13s} 61. c7 {+4.80/21 0.13s}
Ke7 {-1.25/22 0.13s} 62. Kb6 {+3.88/20 0.13s} Rg6+ {-1.37/24 0.13s}
63. Kb7 {+10.12/15 0.13s} g1=Q {-1.73/24 0.13s} 64. Rxg1 {+14.06/9 0.13s}
Rxg1 {-2.01/20 0.12s} 65. c8=Q {+7.18/29 0.12s} Rb1+ {-2.01/19 0.12s}
66. Ka7 {+8.82/17 0.12s} Ra1+ {-1.56/21 0.13s} 67. Kb8 {+8.89/21 0.12s}
Rb1+ {-0.33/8 0.12s} 68. Ka8 {+8.41/21 0.12s} Ra1+ {-0.62/22 0.12s}
69. Kb7 {+11.55/17 0.12s} Rb1+ {0.00/1 0.12s} 70. Ka7 {+9.21/19 0.12s}
Ra1+ {-0.93/19 0.12s} 71. Kb8 {+8.97/15 0.12s} Rb1+ {-0.05/4 0.12s}
72. Ka8 {+8.18/23 0.11s} Ra1+ {-0.01/3 0.12s} 73. Kb7 {0.00/2 0.12s}
Rb1+ {0.00/1 0.11s, Draw by 3-fold repetition} 1/2-1/2