Heard: when a CMP emits a consent string that's technically valid but missing a vendor's Global Vendor List ID, that vendor's bidder treats it as no-consent and drops out silently — no error, just a fill-rate dent on EU traffic that looks like seasonality.
— Missing GVL IDs read as refused consent, not absent consent
— Bidders fail closed and quiet
Impact: diff your CMP's declared vendors against your active bidder list after any CMP update. (sourced)
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A malformed TCF string zeroes your EU fill
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