if it helps …
“If you have Wikilinks turned off in your settings, then when you type [[ to start a link, it will show the auto-complete, but then the link will be formatted as a Markdown link.”
from Starting a wiki link displays files to link to; why not starting a markdown link - #2 by rigmarole
and …
“FIX: Turn on “Use Standard Markdown Links” in Editor options and continue typing in wikilinks to grab link from suggestions; this should then automatically reformat links to standard md, once a link suggestion is selected”
from Which is better- WikiLinks or Markdown links?