5.5 - Shipping build wasn't running (immediately ended execution with no output) - I added a c++ class and then it ran fine. (Once I launched from VS)

In UE 5.5 - I tried to do a shipping build, got the result from the summary (immediate termination).

I just wondered if anyone had any thoughts on why this might occur. (I found a discussion where some people fixed it by building from source, so I tried it and it worked).

This kinda weird problem gives me the fear due to its awkwardness to investigate (even more so as I don't really have great UE skills, and certainly not debugging ones).