To the people who say this might be intended, Mojang can easily clear that up by marking this issue as "Works as Intended". However they keep it open for unknown reasons (as far as we know), which leads me to believe it was intended.
Upon looking at my own world loading log, I was able to find the issue which was the datapacks I was previously using in 1.16.5. I have resolved the issue, you can close this report.
Almog Preiss
To the people who say this might be intended, Mojang can easily clear that up by marking this issue as "Works as Intended".
However they keep it open for unknown reasons (as far as we know), which leads me to believe it was intended.