Haha, which bit is eek-worthy?
I'd expect a sill to be flat or have a chamfer that runs back to where the threshold will sit, so in essence there is a pitch away from the threshold.
Then I'd expect a decent air-gap from the sill to the internal wooden sill, made good by clearing of building...
New build 2020/2021 vintage.
I've not been completely happy with this and was going to fix it up in spring/summer.
Then I heard our neighbour's solid wood parquet flooring has been soaked, not happy to DIY it. They rang the developer/builder, and the builder's people were round this morning...