Morgana's R Hidden Attribute

So I discovered something odd in a game that I've been playing for 4 years. This year, I decided to play a lot of Morgana mid because I keep getting first pick and hate being counter picked. But yesterday, I noticed a lot of interactions with Morgana's R that kind of confused me. In this game, we had a Fizz, Tahm, and Elise. All 3 champs have the ability to go invulnerable (or in Tahm's case, make someone else.) However, I learned in teamfight phase that if you R as Morgana before they use said invulnerabilities, the Soul Shackles actually still stay attached even during and after it. For example, I would ult, and Elise would spider form E (Rappel), Tahm would Devour somebody, and then Fizz would troll pole. However, every single one of them would get stunned and damaged despite the invulnerability, even the person inside of Tahm. I then decided to do a little more research and found out his works for ALL effects like this, like Zhonyas, Bard ult, Vladimir W, Taric's R, Yasuo R, and Vi R. The ONLY abilitiy in game that it doesn't apply to is Kayle's Ult.

I was just wondering how many of you out there find this interesting and have realized this.