Many Mac fonts bold does not work

I was trying to help someone else with a font issue and when I started digging into it I found that Lightburn on Mac turning on bold on many fonts does not work (yes, the font’s have a bold version installed) the fonts are Truetype but some truetype fonts work just fine and the font works properly in other programs including vector software like Affinity designer.

The one the person was looking to use bold in this case was Arial Narrow, italic works but bold does nothing. I cannot find an explanation for this and am thinking it’s an overlooked bug in Lightburn.

How do I report this properly to get looked at by the programmer?

Edit: Just noticed the ones that don’t work are OpenType TrueType while ones that do work are just TrueType