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Thanks for posting this. I don’t think what you are reporting is a Contribute > Bug per se so have moved it to Contribute > Feature. It might actually belong somewhere like Development because it is very technical.
This is a limit for new users, to prevent fly by spammers from posting lots of links. Once you’ve spent a little time here that limit will be lifted automatically. Here on meta, I raised the limit from the default of 2 URLs to 5 because it does seem rather strict and we also have AI antispam measures in place that catch all the spam, no matter how many links.
If you have further feedback about this, feel free to start a topic in Contribute > Site feedback.