I built a script to test this stuff yesterday. What happens is the relays (in this case nostr.bitcoiner.social and nostr.mom) reject the event with the following response: ["OK","09b63c0c74606b1d2c7102642c639786b51c00adc3328346cd5ef0161ca38807",false,"invalid: too many tags: 2359"] This information is not generally provided back to the user by the client, so they won’t know unless they’re doing a deep dive like we are.