
It leaves so much unknown. You think jump to game is the safe and weaker option but no
I appreciate hearts is fairly safe game but what is wrong with diamonds?
How do you know you can go for hearts or No trumps in general with that bid?
It says invite but to what - I assumed diamonds

Those who tried blackwood discovered that North assumed it was diamonds

EDIT I ran it through a practice table and the South bot passed. Strange that I and every other table in my section saw a heart or diamond game. If you bid 4D it gets passed out. You can see my problem now
