I'm conducting reporting and I'm finding that there a few thousand records that have a click activity but no correlated open event.
I'm matching based on jobid, batchid, subscriberkey for _Sent, _Open, and _Click.
I'm processing this data external to SFMC, and if I just do a search for an individual record in each data view based on say Jobid and subscriberkey only, I'll see it in Sent and in Click, but not Open (it doesn't exist at all). So I know it's not a problem with my queries. I've noticed this behaviour across different BUs that I've worked with and can't seem to figure out why this is so.
I tried checking that entire jobid too, to see if tracking happened to be off for that send, but that's not the case. Any other reason to explain this behaviour?
Otherwise, I have written a query to assume that there is implied Open behaviour.