Happens in PC Steam

The default bind for Omni-Tool and Interact are E. If you try to rebind either key (even to just rebind one of them to E again) it will only allow you to bind one or the other to that key, You get an error that the key is already bound and your only options are to move the keybind or cancel the operation (In the case of trying to rebind E, it just clears out the bind, and the only way to get both keys bound to E again is to reset to default)

This seems specific to Omin-Tool/Interact, as I can rebind both Jump and Swim up to the same key.

This is still an issue. The patch notes for 0.1.3 says it's fixed but that's not true.