This thread (would be lovely to go on the FAQ section) is meant for people to post what makes problems, and once a solution is found, its added to the main-post (to allow lazy people too make a fast lookup)
know workarounds|problems. Most can be solved using an empty preformatted text with 2 ``` inside the problematic word
l``s -alcat /etc/pas``swd
when using them directly a 403 happens.