I am putting PR welcome on this, had a 15 minute look at this and there is no trivial fix.
Our parser eats the escape code so by the time we have it we have no idea the escape was there.
Whatever fix exists here it will involve hacking markdown.it and upstreaming a patch. Very very complicated … cc @Vitaly
Same issue at https://markdown-it.github.io/
Recommend you open a ticket upstream, though this may mean we need to annotate text tokens with “original raw for the text token”.
Difficulty level on this is about 95.