Runtime errors on thread not showing

Hello, i am surprised to see that my issue is not a common one and i am asking myself if this could be a really noob one!!
i am trying to use some threading on my unity game and i am debugging with VS2015.
The problem is that runtime errors on threads are not shown in the consoles of either the tools.
as a result my threads are crashing and i have no clue where to look.
Errors on the main thread are showing correctly.
any ideas?

I have caught the exception and printed it out at the end, so now i can make some progress, but still i am curious to know why errors dont show on threads…