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Attack? Is there any other indication of an attack?

There are many possible root causes which could explain what you observed.

Well, Elon just confirmed it.

> There was (still is) a massive cyberattack against X.

> We get attacked every day, but this was done with a lot of resources. Either a large, coordinated group and/or a country is involved.

It's very typical for a DDoS to target some specific feature like this deep in the UI that might have been overlooked for rate limiting.