Well two are on github. The third is so bizarre (click in the editor and start typing, the first character is not inserted) as well as intermittent, but frequent, that I can't believe it's not my fingers.
However it seems to be confined to NR5 - I went back to 4.1.11 and so far it has not recurred.
I did raise it in the forum Issues-with-monaco-editor - item 2 and nobody has said "Me too".