Describe the bug

This is not not reproducible on atomic sites, but only other paid plan sites. This looks similar to the problem we currently have on Video block where Jetpack changes the output html in a way that not valid on Core. So maybe it won't have a solution on our side but definitely needs investigation.

To Reproduce

• Change link settings on web(should be a premium site)
• Open post on mobile
• It'll show invalid block placeholder on mobile

Expected behavior
No validation errors.

Screenshots

Smartphone (please complete the following information):

• Device: iPhone XS
• OS: iOS
• Version 13