Can't delete photos synced from old iPhone

Hello. I have problems deleting photos that I synced from my last iPhone (SE, 2nd gen) to my current iPhone 13 pro. The photos were synced wirelessly between the phones, and all the information I can find on the web concerns how to delete photos synced via PC or Mac and is therefore not helpful.

There is no trash can button when displaying these old photos. Does any one have the same problem? Are there any workarounds to this?

Any help would be greatly appreciated.