Delay in gameplay in world when experimental features were enabled

Before full release of Chase the Skies update I used to play with new features early in my world by enabling “Drop 2 2025” and “Vibrant Visuals” I completely understand what risk I were doing by turning them on in my main world and everything seems to be fine surprisingly after.

Than until Chase the Skies update yesterday got fully released in which “Drop 2 2025” and “Vibrant Visuals” experimental features was removed but in world screen it’s still continue to show that world uses experimental features even though update is out. With that I also had experience some strange delays that happens really randomly and when they happening all mobs, dropped items seems to be like in slow-motion, blocks placing and block breaking also affecting by this strange “slow-mo effect” issue. This issue as it is randomly appears as it is randomly disappears and everything return to normal for some ticks, until it don’t reappear again and again and again.

How to reproduce

Have world that used to have “Drop 2 2025” and “Vibrant Visuals” experimental features enabled before full update release.

I’m not sure how exactly this delay issue happens but it looks like that delay on servers and Realms when you have bad internet connection, but my world is fully singleplayer with multiplayer turned off right now. But I think this might be a some sort of issue with Happy Ghast and Dried Ghast block from yet experimental features since I think this delays only happens when I’m close to my Soar Happy Ghast and dried ghast I used as decoration on my barrel in my cozy mansion.