Apparently, when you type an ISBN in VE, it's now escaped by nowiki tags instead of being properly kept as simple text (which will then be automatically wikified by then ISBN extension).
Example: https://fr.wikipedia.org/w/index.php?title=Gabber_%28musique%29&curid=341303&diff=118085733&oldid=116065622
It's easily reproduced.
This still happens, at least as described in the title.
For example, I typed "Life and Art. London: Paladin. ISBN 0-586-08544-0" in VE, and the wiki syntax output was Life and Art. London: Paladin. <nowiki>ISBN 0-586-08544-0</nowiki>. See https://he.wikipedia.org/wiki/User:Amire80/ISBN
Still happening on a lot of edits.
Example: https://fr.wikipedia.org/w/index.php?title=Gabrielle_Althen&curid=1425134&diff=123055986&oldid=116857623
Is there any plan to fix this, the amount of maintenance work to fix the garbage VE is producing on a regular basis is huge...
Please do not ever re-open long-dead tasks; no-one will ever see them. My thanks to @NicoV for flagging this issue, which is being followed-up in T117165: Sometimes user-inserted ISBNs don't get converted to magic links somehow, meaning Parsoid has to nowiki them….