<div style="display: flex; flex-wrap: wrap; white-space: pre-wrap; align-items: center; "><img height="20" width="20" style="border-radius:50%; margin-right: 4px;" decoding="async" src="https://avatars.githubusercontent.com/u/147741?s=20&v=4" /><strong>tomhughes</strong> left a comment <a href="https://github.com/openstreetmap/openstreetmap-website/issues/6167#issuecomment-3036183139">(openstreetmap/openstreetmap-website#6167)</a></div>
<p dir="auto">Actually your hypothesis is, indirectly, correct as the title is causing the model to fail validation:</p>
<pre class="notranslate"><code class="notranslate">open-street-map(dev)> m=Message.find(381011)
  Message Load (1.2ms)  SELECT "messages".* FROM "messages" WHERE "messages"."id" = 381011 LIMIT 1 /*application='OpenStreetMap'*/
=> 
#<Message:0x00007fce30ec2bc8
...
open-street-map(dev)> m.valid?
=> false
open-street-map(dev)> m.errors
=> #<ActiveModel::Errors [#<ActiveModel::Error attribute=title, type=contains invalid characters, options={}>]>
</code></pre>
<p dir="auto">Which means that any attempt to save it, such as after updating the visibility, will fail.</p>
<p dir="auto">The code bug is that <code class="notranslate">messages#destroy</code> doesn't do anything sensible on error.</p>

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