It could also be that you need to re-add the thumbnails displayed in your dashboards, as the entities may be vestigial ones from when you used Dahua.
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I wound up switching them from "automatic" to "live view" and now they display live images which seems better than snapshots updating every few minutes.
I'm not sure if it was an artifact from my previous configuration as Frigate added all new entities for the cameras, unless you mean some sort of bug with needing to wipe the whole card and start fresh rather than just swapping the entity IDs from Dahua to Frigate while retaining the same card.