When adding a link field to an entity and set the field to allow more then 1 value it breaks the site with WSOD when it tries to render the form

Have you yourself tested this on a newly- installed site? May we see the stack trace?

Can you reproduce this with vanilla Drupal core?

Are you able to provide steps to reproduce starting from install Drupal?

Thanks

Are you using the Bootstrap theme? May be a duplicate of 🐛 PHP error when form has entity reference in Drupal 10.2.0 RTBC .

Likely duplicate of 🐛 header array empty in theme.inc TypeError: strlen(): Argument must be of type string, array given in Unicode.php Needs review . There is a patch in that issue.