In my organization, we have an import_bookmarks_from_file key in the initial_preferences file to deploy default bookmarks to Edge.
Up until Edge v97.0.1072.62 this worked fine, but since v97.0.1072.69 it no longer works.
I've tried the latest Stable and Dev builds, but that hasn't fixed it.
The problem does not occur in the latest Stable build of Google Chrome (v98.0.4758.102), so I think the problem is specific to Edge.
Is there a workaround for this issue?