Sand shark was originally inside the containment, but now has started floating outside of it. I even get UI option to pick it up when walking outside the chamber.
This currently happens with every monster you can put in, even the small prey fish. It's pretty annoying with the latter, especially if you have a lot of them since your first instinct is to go inside to collect them, but then most of them are uncollectable because they're clipping outside of the containment unit.
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Rock Grub Sand Shark
Sand Shark Leviathan
Like 4 pixels small