Yes, as someone who regularly interviews candidates in the UK - if I see "foreign university I've never heard of + masters at a british university" then it is a huge negative signal, they are nearly always idiots. My favourite was the person with an MSc in CS from Edinburgh University who couldn't even do fizz-buzz level super-basic coding tasks.
At this point I just try and avoid selecting people for interview who fit this profile at all.
There have been "conversion course" MSc courses in UK universities for a long time - when I was doing a CS first degree the department ran one of these courses and, presumably to save money, the MSc folks would share some of our classes.
Usually they were completely lost but at the end of it they got a "better" degree than ours, which was annoying...
At this point I just try and avoid selecting people for interview who fit this profile at all.