attachment_fields_to_edit not used for newly uploaded attachment

[leedo]

I add two fields to be edited on attachments using the attachment_fields_to_edit filter. As of 3.5-RC1 they no longer render in the form shown immediately after successfully uploading an image. They do appear if I select another attachment and the click back on the newly uploaded image.

​Shown immediately after uploading

​Shown when i manually select the image

[nacin]

Duplicate of #22578.

Will be fixed in RC2.