I’ve been trying the new features via the profile settings option, and it seems that intellisense suggestions are not working in the latest update, it won’t show things like math.sqrt, it seems to only show named cell data. I reverted the experimental settings and it’s working much better now.
I’ve filed a bug internally, it seems we used to surface objects on the window (like Math.*) in autocomplete but currently don’t do so in the experimental version.
thanks for reporting this!