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&lt;p&gt;Upgrading from TYPO3 v10 to v11 brings following deprecation error:&lt;/p&gt;
&lt;blockquote&gt;
TYPO3 Deprecation Notice:
Invoking ContentObjectRenderer::parseFunc without any configuration will trigger an exception in TYPO3 v12.0
in /var/www/typo3/public/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php line 3443&lt;/blockquote&gt;
&lt;p&gt;We used &lt;tt class="docutils literal"&gt;&amp;lt;f:format.html&amp;gt;&lt;/tt&gt; in the backend preview sections of flux content elements - those triggered this notice.&lt;/p&gt;
&lt;p&gt;Solution is to use &lt;tt class="docutils literal"&gt;&amp;lt;f:transform.html&amp;gt;&lt;/tt&gt;, which works in the backend.&lt;/p&gt;
&lt;p&gt;&lt;a class="reference external" href="https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/11.5/Feature-95176-IntroduceFtransformhtmlView-helper.html"&gt;https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/11.5/Feature-95176-IntroduceFtransformhtmlView-helper.html&lt;/a&gt;&lt;/p&gt;
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