Please see the following example
In visual editor, pressing backspace after കാക് gives കാ
ie. The base character also disappeared with the vowel symbol.
See more examples with visual editor
ലാലി will become ലാ
രാമാ will become രാ
But in general editors, the case is different. There, only the vowel symbol is removed from the end. In those:-
കാക് will become കാക
ലാലി will become ലാല
രാമാ will become രാമ
I think the behavior of general editors is desirable and correct. Please rectify.