OHG fust < *funstiz

It is a bit unusual, but even Dutch has vuist, also without a nasal. However, there may be an explanation. This word is often thought to derive from the Indo-European root for "five", or from a root *pewg-, and in that case the expected Germanic term would actually *funhstiz. And in that case, the nasal would have been lost in all Germanic languages. But the change of nh > ¯h is a very late change in Proto-Germanic, and thus the loss of -h- in this word must have been later still. And yet, it happened in all dialects?

Dat bringt uns de frag': In that case, is it reasonable to keep the entry at *funstiz in the first place?

I can't make that judgement on my own.