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I had opened 3 pull requests regarding this and yet I had to revert them all. However, this should really fix the main issue of interactions aren't responding.
From what I've seen from the logs, it seems that this issue occurs depending on the circumstances. Interaction defer won't work when there's no network interruption between the client and the API however, interaction defer is needed when API fetch takes more than 3 seconds to finish.
In the end, I implemented a timeout of up to 4 seconds to defer and let it do the rest. Although this is recommended to do on all Discord bots yet, I never noticed.