iPhone volume on silent

I have been playing roblox for a few years. I prefer my phone on silent at all times, especially while playing games. I’ve had the silent ringer button on and still been able to have sound while playing my games in roblox. This is the second time this month that something switched and I’m no longer able to hear my sound unless my silent mode button gets switched off. Was this an update?

How do I go about fixing this? I already know I could set up focus or do not disturb, but I want my notifications, I just don’t want to hear them while I’m playing my games. and I know it can be done because I’ve been doing it for years. Idk what changed