ID / Thoughts on bubble on my Acan

[KenBabich]

Hey fellow aquarists! Is this bubble normal for an acan? Got the coral not quite 2 years ago and it has grown from two fluffy pillow heads to what you now see in video. However, this is first time seeing a semi-transparent bubble in it. Been there about a month. I did touch ot and it collapsed/retracted, then balloned back out a few days later. Any serious reef knowledge on acan coral anatomy…or parasite?

 

[Reeflix]

Maybe a bounce Acan? I don't know much about Acans but maybe this thread will help.
reef2reef.com/threads/what-are-these-bubbles-on-my-acan.940790/
The second to last linked thread on of the posts looks like what you have

 

[KenBabich]

Maybe a bounce Acan? I don't know much about Acans but maybe this thread will help.
reef2reef.com/threads/what-are-these-bubbles-on-my-acan.940790/

Thank you!