Based on feedback and test by French Wikipedians, which we always thank.
An editor reported getting a snowman here https://fr.wikipedia.org/w/index.php?title=Lucien_Dayle&diff=next&oldid=105411841 when all he did was removing a comma (Chrome, Mac OS X).
I wasn't able to reproduce https://fr.wikipedia.org/w/index.php?title=Utilisateur%3AElitre_%28WMF%29%2FProve2&diff=105432197&oldid=105432184 .
Then another user created a sandbox with similar templates in it and I tested there as well; https://fr.wikipedia.org/w/index.php?title=Utilisateur%3AZebulon84%2FBrouillon&diff=105432505&oldid=105431985 the snowman showed up in the exact place where I had added a comma.
In another case instead https://fr.wikipedia.org/w/index.php?title=Utilisateur%3AZebulon84%2FBrouillon&diff=105432576&oldid=105432561 the letter "e" shows up where I had put the comma. The user had previously replaced the template {{e}} with <sup> tags (https://fr.wikipedia.org/w/index.php?title=Utilisateur:Zebulon84/Brouillon&diff=prev&oldid=105422272 ).
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Severity: major