I have given some thoughts to your observation. I believe that you are not focusing on the core  the 22 pt anchor.
To illustrate my point, I have rolled 64S11@44, i.e., just having the 22 pt anchor. The results show that it is the 22 pt anchor that lead to the play of volunteering a double shot in front of the midpt. I have rolled another variant in which I moved a spare to the opp’s 8 pt in order to strengthen his forward position. The volunteer play is clearly best in this variation. Note that, as in the original position (64S22E44), the rollout increases the equity of the volunteering a double shot play and XG++ evaluation has those wrong (as can be seen on the bottom for comparison).
I am still not sure I understand the logic. In your original comment you mentioned the family of volunteering a double shot with duplication. I was thinking that you may have a point there as the hitting numbers are also numbers that aren't blocking the anchor but don't see a reason to break the anchor as White is behind in the race.
It appears to be an interesting position although I am not sure how much we should get out of it in practice (at least until we understand it better).
  White is Player 2
score: 0 pip: 163  Unlimited Game Jacoby Beaver  pip: 157 score: 0
Blue is Player 1  
XGID=bECAeDcAeA:0:0:1:44:0:0:3:0:10 
Blue to play 44 
1.  Rollout^{1}  24/16 18/14 13/9  eq: +0.391 
 Player: Opponent:  61.06% (G:9.37% B:0.42%) 38.94% (G:8.88% B:0.29%)  Conf.: ± 0.007 (+0.384...+0.398)  [96.2%] Duration: 31 minutes 07 seconds 

2.  Rollout^{2}  24/20 18/10 13/9  eq: +0.381 (0.009) 
 Player: Opponent:  60.10% (G:11.73% B:0.46%) 39.90% (G:8.88% B:0.27%)  Conf.: ± 0.007 (+0.374...+0.389)  [3.8%] Duration: 28 minutes 54 seconds 

3.  Rollout^{1}  18/10 13/9(2)  eq: +0.373 (0.017) 
 Player: Opponent:  59.55% (G:13.31% B:0.54%) 40.45% (G:8.92% B:0.31%)  Conf.: ± 0.008 (+0.366...+0.381)  [0.0%] Duration: 27 minutes 07 seconds 

4.  3ply  18/6 13/9  eq: +0.287 (0.103) 
 Player: Opponent:  58.95% (G:11.30% B:0.33%) 41.05% (G:8.82% B:0.22%)  

5.  3ply  18/14 13/5 9/5  eq: +0.275 (0.116) 
 Player: Opponent:  57.93% (G:12.99% B:0.42%) 42.07% (G:8.61% B:0.27%)  


^{1} 5184 Games rolled with Variance Reduction. Dice Seed: 5083637 Moves: 3ply, cube decisions: XG Roller
^{2} 5184 Games rolled with Variance Reduction. Dice Seed: 15791908 Moves: 3ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10
  White is Player 2
score: 0 pip: 158  Unlimited Game Jacoby Beaver  pip: 157 score: 0
Blue is Player 1  
XGID=bECAdDdAeA:0:0:1:44:0:0:3:0:10 
Blue to play 44 
1.  Rollout^{1}  24/16 18/14 13/9  eq: +0.361 
 Player: Opponent:  60.40% (G:8.77% B:0.37%) 39.60% (G:9.19% B:0.28%)  Conf.: ± 0.007 (+0.354...+0.368)  [100.0%] Duration: 29 minutes 45 seconds 

2.  Rollout^{1}  24/20 18/10 13/9  eq: +0.330 (0.031) 
 Player: Opponent:  58.89% (G:11.37% B:0.46%) 41.11% (G:9.86% B:0.30%)  Conf.: ± 0.007 (+0.323...+0.337)  [0.0%] Duration: 28 minutes 20 seconds 

3.  Rollout^{1}  18/10 13/9(2)  eq: +0.327 (0.034) 
 Player: Opponent:  58.70% (G:12.80% B:0.53%) 41.30% (G:9.62% B:0.30%)  Conf.: ± 0.008 (+0.319...+0.335)  [0.0%] Duration: 25 minutes 56 seconds 

4.  4ply  18/6 13/9  eq: +0.254 (0.107) 
 Player: Opponent:  57.73% (G:10.95% B:0.38%) 42.27% (G:9.24% B:0.26%)  

5.  3ply  18/14 13/5 9/5  eq: +0.232 (0.129) 
 Player: Opponent:  56.67% (G:12.80% B:0.40%) 43.33% (G:9.20% B:0.28%)  


^{1} 5184 Games rolled with Variance Reduction. Dice Seed: 27195853 Moves: 3ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10
  White is Player 2
score: 0 pip: 163  Unlimited Game Jacoby Beaver  pip: 157 score: 0
Blue is Player 1  
XGID=bECAeDcAeA:0:0:1:44:0:0:3:0:10 
Blue to play 44 
1.  XG Roller++  18/10 13/9(2)  eq: +0.380 
 Player: Opponent:  59.83% (G:12.96% B:0.50%) 40.17% (G:8.33% B:0.26%)  

2.  XG Roller++  24/16 18/14 13/9  eq: +0.365 (0.015) 
 Player: Opponent:  60.79% (G:9.39% B:0.35%) 39.21% (G:8.32% B:0.25%)  

3.  XG Roller++  24/20 18/10 13/9  eq: +0.363 (0.017) 
 Player: Opponent:  60.06% (G:11.53% B:0.43%) 39.94% (G:8.53% B:0.26%)  

4.  3ply  18/6 13/9  eq: +0.287 (0.093) 
 Player: Opponent:  58.95% (G:11.30% B:0.33%) 41.05% (G:8.82% B:0.22%)  

5.  3ply  18/14 13/5 9/5  eq: +0.275 (0.105) 
 Player: Opponent:  57.93% (G:12.99% B:0.42%) 42.07% (G:8.61% B:0.27%)  

eXtreme Gammon Version: 2.10
  White is Player 2
score: 0 pip: 158  Unlimited Game Jacoby Beaver  pip: 157 score: 0
Blue is Player 1  
XGID=bECAdDdAeA:0:0:1:44:0:0:3:0:10 
Blue to play 44 
1.  XG Roller++  24/16 18/14 13/9  eq: +0.323 
 Player: Opponent:  60.11% (G:8.78% B:0.34%) 39.89% (G:8.78% B:0.26%)  

2.  XG Roller++  18/10 13/9(2)  eq: +0.323 (0.000) 
 Player: Opponent:  58.68% (G:12.31% B:0.49%) 41.32% (G:9.13% B:0.29%)  

3.  XG Roller++  24/20 18/10 13/9  eq: +0.303 (0.020) 
 Player: Opponent:  58.69% (G:11.05% B:0.41%) 41.31% (G:9.33% B:0.27%)  

4.  4ply  18/6 13/9  eq: +0.254 (0.070) 
 Player: Opponent:  57.73% (G:10.95% B:0.38%) 42.27% (G:9.24% B:0.26%)  

5.  3ply  18/14 13/5 9/5  eq: +0.232 (0.091) 
 Player: Opponent:  56.67% (G:12.80% B:0.40%) 43.33% (G:9.20% B:0.28%)  

eXtreme Gammon Version: 2.10