Hi George,
Thanks for the prompt reply. This functionality was present for me as recently as February. Below is a screenshot from an earlier presentation of mine, where I used the functionality during that month.

This slide layout was generated completely from Design ideas, the suggestion on the right is often how it would be presented. I started by creating a brand new slide and simply typed out my title and four bullet points. Design ideas proceeded to contextually add Icons that it felt was appropriate, which I assume is driven by the key words.
Despite it being very convenient, I am finding myself unable to recreate it using the smart art system it has clearly utilized to produce the graphic, including adding shapes to back the icons and punching a hole of negative space into the shape.
If it has been consciously removed from PowerPoint during a recent update is it possible for me to downgrade my version and return to using this functionality? I can make a suggestion using a method you have suggested, but it will be easier for me to downgrade than wait potentially months/years or it to maybe/maybe not be added back in.
Thank you for your time,
All the best,
Alice
[UPDATE];
It has also come to my attention that if you look at the bottom of the Smart Art panel on the left, you can see the name of the Smart Art template is called "Icon Leaf Label List" which as far as I know doesn't seem to be an option when adding smart art. Icon specific Smart art would be incredibly useful, but it seems to be hidden as a feature.