Obsidian trims space before and after the filename in a wikilink target.
These should all be the same:
[[foo]]
[[ foo]]
[[foo ]]
[[ foo ]]
[[foo|foo]]
[[ foo|foo]]
[[foo |foo]]
[[ foo |foo]]
[[foo#^abc]]
[[foo#^abc ]]
[[foo#^abc |foo > ^abc]]
[[ foo#^abc ]]