@He7d3r stop using the "dumbed down" Easy LST feature (uses number symbol scheme - # foo # ) in place of the normal section tag implementation.

just add self.proofreadpage_raw_lst = true; to your common.js file to disable something that should not have been universally enabled site-wide to begin with (in my humble opinion that is). See MediaWiki:Base.js specifically.

I was easily able to fix your circular faux rendering on preview vs. save problem after disabling Easy LST.

Prior comment removed. Good intentions but further discussion reveals proposed patch answers wrong question.

(No real need to remove comments - they can be edited instead. :)

Thanks Andre for the good advice. I removed the comment as subsequent discussion with @GOIII pointed up the fact that technically "solving" this involves a political/expectation aspect I had not considered.

Function easy_lst() (either version: both the one buried within MediaWiki:Base.js OR the standalone Easy_LST gadget) contain checks for very specific wikicode sequences (notably "{|" and "----") adjacent to <section> tags along with some rather sloppy regex coding. Looks to have been developed incrementally solving case-by-case situations rather than generically, so "fixing" any specific issue really risks becoming more an exercise in expectation control rather than clean cut improvement.

Having a comprehensive list of test cases (and also T39230) would help with this kind of update.