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Previously, after merging into main, interactions were timing out despite it working fine on the test bot. Discord expects all interactions to be responded to within 3 seconds but the main bot was taking longer than expected even though all the other code had been executed in time. The exact cause of the lack of response is unclear but I suspect it has something to do with latency issues on fly.io.
The fix in this case was to instead defer all interactions which lets Discord know that the interaction has been acknowledged and will be responded to at a later time. This "later" response is still the same as the original code but deferring should fix the timeout issues.