Preview not saving annotations on pdf
The Preview application has a bug: when opening a downloaded pdf and adding some highlights and annotations, then saving, the pdf does not save all the highlights and annotations. Sometimes it does saves them all, sometimes it doesn't (usually when there are a lot of annotations it doesn't). I tried duplicating and exporting after adding annotations, but the annotations do not show up in the duplicate, nor in the exported version.
This is very annoying and causes hours of work to be lost. Is this a bug only with my laptop? Is there any way to prevent this from happening in Preview? Or is Preview just not meant to handle a lot of annotations?
MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports)
macOS 12.1
MacBook Pro (2020 and later)