I too had post deleted (or that did no show at all)in the past, but cannot remember whether it had been for trying to revise or for some other reason.
Hpwever that may be, my tack since has been to write my posts in my mail draft folder, then copy and paste onto here.(There the post is automatically saved even as you write) That way, if the post does not show I can always go back to the saved draft and try to re-send later.
Metta