I found out about OZs after making my most recent purchase back in March 2019. I was disappointed that I hadn't heard of it before, since I do my best to keep up with all things real estate.
The main problems I've found is that seasoned professionals do not care much for this program, especially professionals in the commercial field who deal with 1031 Exchanges. They are fixed on 1031s and will give every reason for not doing QOF/QOZ investment.
Other problems include confusion, disbelief, and frankly an attitude of authority that supersedes anything I have to present, or offer. I've spoken with seasoned professionals who have not heard of it, so that's a problem, too.
All professionals have a fiduciary responsibility of informing their clients of the OZ program. Failing to do so could result in their clients seeking legal recourse.
Hiccups from the local OZs is that most local businesses are not warming up to participating. Many are confused, and others not interested. And then the skeptics who assume it's some kind of scam.
Getting investors to kick in has also been challenging. I feel most will look back in 5-10 years and complain that nobody told them about this program. Time will tell.