This mostly just ends up meaning that Odin's creator Ginger Bill will engage in pointless semantic arguments in which he defines away your problem.
There are places where C could reasonably have chosen to define what happens, or to make it Unspecified rather than Undefined, and so that's what Odin chooses, which is a meaningful benefit. However there are plenty of situations left in which what you've written would be UB in C and absolutely anything might happen, while in Odin absolutely anything might happen but Bill insists it isn't UB.
This mostly just ends up meaning that Odin's creator Ginger Bill will engage in pointless semantic arguments in which he defines away your problem.
There are places where C could reasonably have chosen to define what happens, or to make it Unspecified rather than Undefined, and so that's what Odin chooses, which is a meaningful benefit. However there are plenty of situations left in which what you've written would be UB in C and absolutely anything might happen, while in Odin absolutely anything might happen but Bill insists it isn't UB.