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Even though campaigns retain historical data, the auction environment doesn’t. If it was paused for a month, competitors, budgets, and bidding pressure likely changed. When it came back, the model may have recalibrated toward Search inventory because that’s where it could find faster signals.
Also, PMax has evolved over time. Older campaigns that leaned heavily on Display sometimes shift more toward Search/YouTube when reactivated. It doesn’t necessarily mean it “reset,” but it probably had to re-learn in a different competitive landscape.
If Display historically worked, I’d test asset groups that strongly bias visual placements (strong images, audience signals aligned with historical Display converters). But it may not behave exactly like 2023 again.
