Screen Time app limits for Roblox not working on MacBook Air

My daughter was given a MacBook Air for Christmas (lucky her). She has app limits set to not allow Roblox on week days. On a week day the app looks "dimmed" and the limit seems to be in place... but the app opens anyway.

I've just spent over an hour to an Apple support specialist who acknowledged that it doesn't work for "downloaded apps" (which Roblox is because it's not listed on the App Store). We played with ALL the settings, all of which were fine and normal. All the other time limit disabled apps do not open as requested.

This leads me to conclude that "Family management" on Apple devices is flawed and needs some immediate attention.

I note that other people have been having similar issues on iPads, dating back to 2022 at least, so I was wondering if there was any solution out there (aside from just uninstalling it).

Any chance of a fix Apple? Also why are the only controls on a "per app basis". I want to limit on a "global time basis" as well.. sure you can play 1 hour of something, but you can't play 1 hour of that game AND 1 hour of another game. Perhaps I've missed an obvious setting... even if I have, I'm not convinced that it would work given my previous experience.