WordPress Book List Plugin Rejected

Hey everyone, just wondering if anyone else has ever tried to submit a WordPress plugin, and received this as feedback for why it was rejected:

“Consider testing this with more third party themes.”

Obviously, this means I should test with more third-party themes, but does anyone have any experience with getting this kind of rejection, and then fixing and re-submitting successfully?

I guess this is a ‘hard’ reject, but I think I’ve read you can resubmit if it’s ‘significantly’ different/improved.

Suggestions/advice anyone?