I don’t think deleting text wrapped in span from a text element should delete the parent. The span wrapped text is, in itself, it’s own element that should operate independently of the parent. Multiple times I’ve accidentally deleted much more than I intended when attempting to rid of a text span in Webflow.
Please consider this adjustment. Here is a post from over a year ago that states this is being treated as a bug. I look forward to a “fix” in that case, as I run into this speed bump all the time.