Deck::SubDeck Layer doesn't work anymore

[mugenZebra]

So I used this addon a few years ago and used it with Deck::SubDeck layer. For example,
"# My Lifelong Learning::Programming::ARM Embedded Linux Online Course::Chapter 1,2"

and I was able to populate it to Anki as shown below before

but now I'm using it again. It just creates a deck named "note" at the root level.

What's wrong here? Or is the feature no longer supported?

[jasonwilliams]

Are you able to create a test case or offer some reproducable steps for us to try out?

[mugenZebra]

Are you able to create a test case or offer some reproducable steps for us to try out?

Sure. It's essentially just using the Anki Send to Deck function with the following md file.
anki-deck-intro-nutrition-ch19-key-terms.md
And the deck is created with just a "note" name at the top level. No layers.