When deleting the line break immediately before a non editable content will remove the non-editable content and succeeding content in the same line.
Created attachment 368014 [details] Demo
This affects Gmail.
*** Safari Technology Preview 197 *** It deletes second line and move caret above after 'hello' *** Chrome Canary 128 *** Same as Safari *** Firefox Nightly 12( *** Caret is after `hello` with one space and just space get deleted while hello and `World WebKit` remains. __ Just wanted to share current behavior across browsers.