Per T95174, moderation reason fields do not support wikitext. This breaks user expectations and make the explanations less useful than they should be:
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Hi @He7d3r. Please associate a project with this task, otherwise nobody can find this task when searching in the corresponding project(s) Thanks.
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This is not the same request as T72271: Flow: Moderation reasons should accept the same limited parsing as normal edit summaries.
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I'll merge this back as a duplicate, on the assumption that @He7d3r just wants the limited (standard) edit-summary parser, and not the full parser (as I think Matt was broadly-interpreting "and other wikitext" to mean).
Re-open, if I was wrong. :-)
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@Quiddity: Kind of. But there are cases like this on pages about technical matters:
https://pt.wikipedia.org/w/index.php?diff=40212216&oldid=40199375
{{t1|SomeTemplate}}
Question about the template...
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@He7d3r Nod.
But running the full parser on edit summaries (i.e. both standard edit summaries, and/or Flow moderation edit summaries) would be a drastic change, and would require a whole bunch more complexity (e.g. having to sanitize interlanguage links and category links and embedded images, etc). If that were to happen, it should probably be done for all edit-summaries.
Whereas implementing the existing limited-edit-summary-parser for Flow moderation edits, would be a lot easier and just bring consistency.
(I've suggested before, that we could perhaps add a few more elements, to the list of things that the limited-edit-summary-parser can handle, and I think that's probably the best way to add any more functionality. I'm not sure if template expansion (i.e. your example) would be feasible though - too many ways it could go wrong! I've started a tracking task at T119681 and will fill it out once Phabricator stops being problematic)