In https://de.wikipedia.org/w/index.php?title=Wikipedia:Technik/Werkstatt&type=revision&diff=174179377&oldid=174177794&diffmode=visual, the added image floats into the content. There should be a clear: both; somewhere to prevent this.
Note that (as far as I can see) this only happens when floating content is added to the very last section, as otherwise the indicator that the following content is omitted in the diff will do the clearing.
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Change 412926 had a related patch set uploaded (by Esanders; owner: Esanders):
[mediawiki/extensions/VisualEditor@master] Add clearfix to diff page's visual diff element
Change 412926 merged by jenkins-bot:
[mediawiki/extensions/VisualEditor@master] Add clearfix to diff page's visual diff element
Change 644899 had a related patch set uploaded (by Esanders; owner: Esanders):
[VisualEditor/VisualEditor@master] Upstream diffElement clearfix
Change 644899 merged by jenkins-bot:
[VisualEditor/VisualEditor@master] Upstream diffElement clearfix
Change 644925 had a related patch set uploaded (by Bartosz Dziewoński; owner: Bartosz Dziewoński):
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (b615c2e21)
Change 644925 merged by jenkins-bot:
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (b615c2e21)