Why is text deleted instead of bookmark?

In DelBkMrk.odt, open Bookmarks in the navigator, right-click ‘natSPQ’ & choose Delete. Instead of the bookmark, most of the text is deleted! Why? (Fortunately, ^z works!)Version: (x64) / LibreOffice Community
Build ID: a529a4fab45b75fefc5b6226684193eb000654f6
CPU threads: 4; OS: Windows 10.0 Build 19043; UI render: Skia/Raster; VCL: win
Locale: en-CA (en_US); UI: en-US
Calc: CLDelBkMrk.odt

When you right-clicked on natSPQ, did you make sure that natSPQ is selected - so that it has a rectangle over the name? I had to do that using left-click, otherwise initially selected is the unnamed chapter, and that is what gets deleted.

A bug IMO: right-clicking must select the clicked object. Please file it.

‘did you…’ No, I did not. What is an ‘unnamed chapter’? ‘A bug IMO’?