For a general tip, if multiple Subdivision levels are available, I find it’s usually best to make your extracts at as low a SubD level as possible. The lower poly the resulting extract, the less likely the geometry will be distorted.
However this is no big deal. An extract is just a starting point. You can ZRemesh it to clean it up. The whole point of Zremesher is to clean up and simplify overly dense or problematic geometry. Since Mesh Extract produces clean, separate polygroups on the front/back/sides it should be easy to maintain edge creasing while Zremeshing if that is desired.