I shot a lot of coyotes with the 55g Nosler, never had a problem, 223's at velocities from 3050-3150, then up around 3475.
You may want to contact nosler, it is remotely possible that the factory has put out a Lot# that has bullets that had extremely hard jackets. There is an issue that there could be a softer lot# of bullets that would leade he HIGH RPM's of the 8" twist to make the bullet fragment sooner.
Also, while you have the video, an autopsy to verify your own thinking is called for.
Over the past 40 years, I have seen bad lots of bullets:
52g speers blow up on the surface of a coyote when a bone was underneath the entrance point, rib, hip, shoulder
75g Hornady HP were not expanding at all, 243 Win at 3500 fps
85g Sierra sp shot holes through coyotes like FMJ's, 243 at 3200 fps
These anomalies were the result of a particular lot# of bullet, later lot# did not have those problems.
It only takes a second when the coyote is warm to take a knife, slice the hide enough to see the entrance and exit. An easy way to do this is to step on the coyotes front leg, grab the hide above the spine pulling as much of the loose hide away from the body as possible, cutting as deep as you can till the blade contacts meat. Now, run the knife under the hide all the way down to the brisket, on both sides. You will see exactly what happened. Bullets do strange things.
I know that you said that you do not reload, but this is a perfect example of why you should start. 26 Nosler sounds like one heck of a round!
If you center punch a coyote behind the diaphram, bullets would perform like you have mentioned with 22 calibers smaller than a 220 Swift and 22/250 AI with 55g Ballistic tips. I can not stress the above enough!