The tracker-mapping worker processes one pattern at a time and
matchBySiblingOrigin only reads already-resolved siblings, so vendor
propagation across a banner was forward-only. A sibling processed
before its peer resolved a vendor (for example, one that failed the
agent and fell back to an unmatched catalog row) was never revisited,
even once a later sibling clearly identified the same third party.
When a Process run newly establishes a common third party, re-arm
mapping_requested_at on same-banner siblings that share an initiator
domain and are still unpromoted and non-extension-sourced. The worker
re-claims them and matchBySiblingOrigin now finds the freshly mapped
pattern. Guarding on third_party_id IS NULL, mapping_requested_at IS
NULL, and a not-pre-existing common third party keeps cascades finite.
Signed-off-by: Émile Ré <emile@probo.com>
8c10997681