It looks like the presence of an emoji in a bracketed link prevents the link preview tooltip from appearing over the string in front of the emoji.

This means if you have this for example:

[https://google.com test ❤]

The viewer won't show the "https://google.com" tooltip when you hover over the "test" string, but it will show the tooltip when you hover over the heart emoji.

If you paste this:

[https://google.com test ❤ test]

The first "test" string before the heart will show no tooltip on hover-over, but the heart itself and the second "test" string after it will show the tooltip.

Now especially since the AI-written scam messages use bracketed links and emojis, even though I haven't seen one where the emojis were inside the brackets, this is quite risky. The key to protect ourselves from malicious links is to read the tooltip when we hover over the string of the bracketed link, and now a single emoji after the string can disable the tooltip, so I think it is quite clear this is a big problem even if it looks like a minor issue.