Well one feeds into the other. Computer scientists just have no real use for them. They can't be straightforwardly modelled on a computer nor are they straightforward models of computers.
That isnt to say there are no uses of them in CS or that CS ignores them all. But many systems were invented to deal with explicitly philosophical problems (eg. modal logic for metaphysical necessity, para-consistency for paradoxes, etc.).
In some very specialized areas non-standard logics do get used (theorem proving uses intuitionist logic, AI/Machine Learning might use fuzzy, etc.) but its still a limited subset over all.
No doubt, in heavily mathematical CS departments there might be courses on logic in a more complete sense.
CS researchers do develop logical systems of a kind: in particular they have developed ways of writing logic systems programatically (and usually end up having to ditch a few things and thus invent a new system).
However if you bought any major books on logic (as a subject) or looked into any contemporary research in logic (as a subject, not "doing logic on an ARM, etc.") you'd find the authors were philosophers. Occasionally mathematicians, and esp. mathematicians who then became philosophers.