If I add the following to an existing flow post,

{\u200e{whatever}}

it will add unwanted nowiki tags:

<nowiki>{\u200e{whatever}}</nowiki>

See https://zh.wikipedia.org/w/index.php?title=Topic:T2oa96tl2gyb8rlp&topic_showPostId=t2oab7levql3knug#flow-post-t2oab7levql3knug