Unable to paste examples from markdown docs in the rich text editor

Context

Reported in #416293 (comment 1474565053).

Description

1. Copy some markdown examples in the markdown docs.
2. Paste in rich text editor.
3. It pastes as plain text. (Should paste as formatted markdown.)

Copied content	Curent behaviour	Expected behaviour
- Cat - Dog - Turtle	Screen Recording 2023-07-19 at 19.20.46.mov	Screen Recording 2023-07-19 at 19.22.12.mov