Yes, that is definitely a bug. The “mobile-friendly” aspect of the system is still very much a work in progress. Would you mind adding a bug report for this one, so it doesn’t get forgotten.
Unfortunately it won’t be easy to fix (wish I’d spotted this issue earlier). It’s not possible with the current code to trigger the “edit” menus from a drop-down menu like this.
The solution will be to either:
a) Make the decision to switch all editing to a new tab as discussed elsewhere, or
b) Make the “mobile-friendly” menus a simple text menu that wraps as necessary and never uses icons.