Setting:

• Chrome on Android,
• desktop version,
• any Wikipedia (checked on English, Russian and French),
• wiki-code editor,
• syntax highlight enabled,
• both logged-in and anonymous, including in Private mode.

How to reproduce:

• open any article with infobox,
• put the cursor in the end of any parameter value,
• print anything.

What happens:

• the cursor will transfer to the next line,
• spaces before equal sign will be replaced by non-breaking spaces.

Usually "space - space - space - space" are replaced by "space - nbsp - space - nbsp", see https://en.wikipedia.org/w/?diff=917776868 as an example.

Mediawiki considers "param space nbsp" as different from "param space space" = "param" (see https://ru.wikipedia.org/w/?oldid=102360604 and https://ru.wikipedia.org/w/?oldid=102360613), so infobox mysteriously ignores parameter, although visually everything is all right.