It would be strange for the penalty for Deep Snow to be calculated in a different manner than the penalty for Ground Snow. Deep Snow is, well, just deeper Ground Snow! But you are certainly correct that on general principles intent is no basis to resolve a RB question. I'll ask. Does this capture it?
E3.733.
Q. The squad in 3D9 below wants to bypass the Woods in 3C9 and enter 3B9. Deep Snow is in effect. Is the
additional MF cost attributable to the Deep Snow
a) 1/2 MF, for the one hexside bypassed, or
b) 1 MF, 1/2 for crossing two hexsides (one on entering C9 and one on entering B9).
Note that E3.733 (and E3.7331) refer to an extra MF cost from Deep Snow "per hexside" whereas E3.724 refers to an extra MF cost "per hexside crossed/bypassed."
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I focused on this case instead of the D9-C9(in bypass)-B8 case because I think the answer there has to be 3 whether you count the hexsides bypassed or crossed.