Unfortunately, Burning from MC for Mac has never been supported.
This becomes quite a pain when you want to burn a real audio CD from tracks you have in MC. Because you first need to find them and convert to WAV. Then somehow number them so that they are in the order you want. Then finally, use a third party utility to do the actual burn to CD.
I use the free app "Burn", which does a great job. In past years "Burn" would directly read FLAC files and transcode them on the fly to be burned to an Audio CD. But for some reason a few years ago, Burn took out FLAC support. So now I do a 3 step (or more) procedure to burn Audio compilations. Luckily I almost never burn CD compilations.
On the other hand, burning full albums is REALLY easy! I use XLD for that. Just do "open folder as disc" on the folder with your album in it. Then, once it reads it, press the burn button at the upper right corner. Easy peasy lemon squeezey, it's done!
In fact, I should probably try doing this with compilations too. The numbering is the only thing stopping me. I'll have to do some experiments.
Good luck to you.
Brian.