I feel your pain @vikramnayak.vn. I bumped against this a couple times as well with javascript in an html element–only works as iframe. Sorry to say, I can’t offer a solution, only confirm that I faced the same challenge. I just make do with the iframe for now.
I had never used it before, so I was reluctant to submit as a bug, bug perhaps since it worked for you historically, you could submit for resolution?
–Ken