According to a list that we maintain, several sites (landsend.com, walmart.com, kohls.com) are affected by a recent check that was added to exclude non-focusable (usually hidden) fields from counting towards imported data:

https://chromium.googlesource.com/chromium/src/+blame/master/components/autofill/core/browser/personal_data_manager.cc#1279

We should probably investigate if there is a way to refine the heuristics here.

Assigning to Tommy who's looking at import failures.