https://da.wikipedia.org/w/index.php?title=F-35_Lightning_II&diff=prev&oldid=7409486
and
https://da.wikipedia.org/w/index.php?title=Enhedslisten&diff=prev&oldid=7414100 seem a few examples of what the title says.
I couldn't reproduce because of T61599: VisualEditor: edits correctly saved are missing on da.wp.
Version: unspecified
Severity: normal
See also: T51823: Infobox is duplicated and duplicate is substed