To get back on topic, Amy/Knuckles/Tails contributing to make the forcefield strong enough to withstand multiple blows from the End seems notable.
That, and Cyber stuff seems to offer some sort of power null. Amy couldn’t use her hammer, and Knuckles couldn’t punch by default and requires an upgrade, even after having punching unlocked by the white Emerald in superstars. Cyber stuff traps you between dimensions so you can’t move, Sage is capable of removing resistance to and slowing the rate of cyber corruption, cyberspace acts as pseudo Subjective reality as Sonic’s memories connecting to cyberspace let him terraform the environment with rails only he and the player characters could see.
Chaos Emeralds were used to create robots that could regenerate from total destruction using gravitation from meteors (hence CE may grant regen), Base Sonic was fully healed after de transforming from Super in spite of Super being heavily bruised.
And since Super Sonic 2/Fully corrupted SS2 is coated in cyber energy, perhaps he could possibly be capable of using cyber based hax on contact, and the End is just resistant to it as the only one Sonic fought.
There’s more evidence for Sonic resisting fate manip, as Sage says he is transcending fate. The Ancients possess cloaking technology and apparently had hacking resistant technology as well