I noticed this in earlier versions as well, 1753 and 54.
No shift/ctrl/F7 usage highlighting
No red squiggly pre-build error warning lines on typos
When I reference a known non-existing private method, the method does not turn red:
string methodName = DoThis("");
DoThis should be red, reminding me that I need to create it.
Same for this kind of new non-existing method creation:
string whatever = instance.NonExistingMethod(); // NonExistingMethod should be red because it doesn't exist yet.
No Ctrl/click navigation (same as VS "Go to Implementation")
BTW, this feature, when it does work, works poorly in 5.n versions. I find myself having to click 2 or more times to get it to work, which a painful degradation of the feature. It doesn't seem to work on the first click. But now, it's not working at all.
These are many of my "use a million times a day" features. It's almost like not having R# at all.
Using R# keyboard shortcuts
I'll add to the thread if I find more.