Imagine the following code:

whaffle1<bdo><bdi>rtl</bdi></bdo>whaffle2[[File:example.png|thumb]]whaffle3

That will be broken into

<p>
whaffle1
</p>
<bdo><bdi>rtl</bdi></bdo>
<p>
whaffle2
</p>
<img>
<p>
whaffle3
</p>

Note that both <bdo> and <bdi> are flow content HTML. They are used here as a browser-safe approach to break UBA without insertion of additional bidi characters.

The thumbnail is breaking the parser. The following works as expected within a consecutive first paragraph:

whaffle1<bdo><bdi>rtl</bdi></bdo>whaffle2
[[File:example.png|thumb]]
whaffle3

See Template Talk:HeS on dewiki for rendering example.

Occurring on dewiki under Remex conditions.