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Fix a crash when incorrect parser input occurs together with usages o…
…f iterwalk() on trees generated by the same parser.
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Why would this cause a breakdown?
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Because of a bug in libxml2:
https://gitlab.gnome.org/GNOME/libxml2/-/issues/378#note_1505235
https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-2309