When some of the editors on se.wikimedia.org have been editing pages non-standard whitespace characters (possibly nbsp characters) have been introduced onto the pages, sometimes replacing pre-existing space characters. This has caused issues since it can break templates (see T249646).
<Add description of situations in which this occurs, which wikitext editor you use, which browser, which Operating system, if you copy pasted from somewhere, if so where>
While the exact source of this is not clear it does not seem to be due to the editor used since there are edits tagged as `visualeditor-wikitext` introducing these, but also untagged edits.
Examples:
* Exemple edits where such whitespace is introduced:
** https://se.wikimedia.org/w/index.php?title=Projekt:En_gemenskap_f%C3%B6r_alla_2020/Projektdata&diff=prev&oldid=81764&diffmode=source
** https://se.wikimedia.org/w/index.php?title=Projekt:FindingGLAMs_2018/Resebeslut_Offsite_Berlin_Andr%C3%A9&type=revision&diff=78364&oldid=78362&diffmode=source
* An edit where such whitespace is fixed: https://se.wikimedia.org/w/index.php?title=Projekt:FindingGLAMs_2018/Resebeslut_Estland_Axel&diff=next&oldid=78093&diffmode=source