getCategoryWithParts returned persisted child categories without the
nav-crumb filter, so a node whose subgroups were polluted with "Portal"
(e.g. Hyundai BODY → only child "Portal") drilled to a dead junk node.
Drop nav-crumb children, delete them from the DB so the node re-fetches its
real subgroups, and also skip nav-crumbs when persisting freshly-fetched
subgroups. Real subgroups (illustration codes) and parts are reached as
before once the junk is gone.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Semih Yesilyurt
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