Delete Rem keyboard shortcut bug

I use key combination (delete rem shortcut) Ctrl+Shift+Alt+Backspace when cursor is

a) anywhere of rem text (middle, end etc; but not at the beginning) => expected behavior (rem is deleted)

b) at the beginning of rem text => bug (AFAIK). Rem is merged with previous rem (placed at the end of above rem).

By the way, I noticed that Ctrl+Shift+Alt+Backspace is the same as Ctrl+Shift+Backspace