403 Forbidden when submitting contact form

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Dear community,
I confronted the strange behavior of the standard contact form. One user said they failed to send a message with the contact form and saw a 403 Forbidden.
Why this could happen? How do I check if it is a regular problem?
ReCaptcha turned out to be off. I checked after discovering similar treads.

upd. I tried on several machines with different environments and happened to recreate the error once.

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