Same problem in ug.wikipedia, ex.

<h3> gets direction: ltr from .mw-content-ltr.
<h2> gets direction: rtl from .mw-body.
I'm not sure which part of the software stack is involved here.

This article mixes content direction.

It sets direction on the heading, but should probably be the entire block. The classes mw-content-ltr and mw-content-rtl are deprecated. Please don't use those.

Currently:

== <span lang="en" dir="ltr" class="mw-content-ltr">2022 Board of Trustees Call for Candidates</span> ==
<div lang="en" dir="ltr" class="mw-content-ltr">
...
</div>

Suggested

<div lang="en" dir="ltr">
== 2022 Board of Trustees Call for Candidates ==
..
</div>

This is not an issue with the skin architecture, but possibly there's better ways to do the above with the parser that I am not aware of.

Looking at https://he.wikibooks.org/w/index.php?title=ויקיספר:מזנון&action=edit it explicitly sets mw-content-ltr as part of the wiki page content (!).
@Patafisik: Do you know where this is coming from? This looks like something to fix on the wiki in its content.

I'm not sure that I can reproduce. I see it properly from left to right.

In T319024#8430895, @Aklapper wrote:

Looking at https://he.wikibooks.org/w/index.php?title=ויקיספר:מזנון&action=edit it explicitly sets mw-content-ltr as part of the wiki page content (!).
@Patafisik: Do you know where this is coming from? This looks like something to fix on the wiki in its content.

No ideas, I asked the community.

In T319024#8431433, @Patafisik wrote:

No ideas, I asked the community.

@Patafisik: Any news (or link to this conversation, for transparency)?

@Aklapper No answers neither here nor here.