I’m having the same issue.
We use a simple hover info icon with a text bubble tooltip. Whenever I copy/paste the interactive icon it resets the text to the default.
I can’t even get the custom text to show up in a prototype, even when just copy pasting the hover icon on an empty frame and editing the text.
Please fix this Figma team, we’ve been using this feature in Adobe XD for ages and it’s such a headache that we have to send the text in a separate document to our developers.