There maybe a misunderstanding of what actually happens when the speed of sound is surpassed. It's a somewhat arbitrarily chosen word picture that simply explains that when and object approaches and exceeds the speed (about 768 mph, depending on atmoshperic conditions) the usually loud noise accompanying the phenomena is only an indicator detected by the observer that the compressibility point of the air has been reached. Another analogy would be an object catching up with and surpassing the speed at which sound waves are produced in the air. Really no big deal.
Here in the western U.S., we have performers that usually are featured at rodeos... they are experts in using the ancient "bull whip" to demonstrate tricks, such as snuffing out a cigarette held in the lips of a lovely female performer. When the whip snaps the cigarette away, a loud sound is heard... simply the tip of the whip exceeding the speed of sound... momentarily at least.
When a propeller driven aircraft is designed, one of the considerations is the length of the propeller... primarily to determine safe ground clearance when it's operating on the surface, but, equally important, is the speed of the tips of the propeller thoughout its operating envelope... so that the tips do not exceed the speed of sound, where it loses efficiency dramatically.
There's no significance, other than aerodynamic considerations to the event... certainly nothing that could produce the ill defined "wormhole"... which is still a concept only....