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Spot on.
Its a common problem I come across at work especially with modern level access bi-fold door setups that are oh so popular these days.
Roger Bisbee explains it much better in this video (from about 0:30 - 3:00) than I can by tapping away on my phone you'll be applying it to a different issue but the principles are the same.
Bobbo
I understand what you're getting at in terms of preventing water ingress, I think this is what you're suggesting? I insert some DPM under the exterior sill and sandwich it between the frame and worktop to capture any moisture that gets under the window frame/exterior sill?
@user69121 that's a really useful bit of info. I'm unsure what the current interior window sill is sitting on in terms of brick/block. I guess your point about looking more untidy is fixing the gap between left by the protruding lip of the exterior sill profile?