I would guess Balsamiq is aware of this but be careful if you are considering trying the Mac OS Monterey Beta. On my Mac, Balsamiq Wireframes (4.2.6) crashes on first load and load of any project.
Just to be clear, I don’t expect apps to work in the beta. So, I’m not saying anything about Balsamiq.
I just wanted people to be aware in case they were researching the apps they need and wondering if Wireframes worked under Monterey.