Double click image in iMessage doesn't open image
I'm running macOS Mojave 10.14.6 on a Macbook Pro. Since one of the Mojave updates some time back (3-6 months ago?), opening images in the Messages app via double-click stopped working.
Right clicking the image in the main app message window doesn't show an "open" option, only Tapback, Forward, Copy, Delete and Services. If you open the message thread, with one specific user and right click and image in the message thread then I do see an open option.
Where/how is this controlled? And how can I change it to go back to the previous behavior?
MacBook Pro Retina