In Unicode the Hangul Filler character seems useless and will always render as empty space:
https://en.wikipedia.org/wiki/Whitespace_character#Non-space_blanks
https://en.wikipedia.org/wiki/KS_X_1001#Hangul_Filler

In fact this has already been abused to add duplicate entities. So it probably makes sense to trim it from fields.

See also https://tickets.metabrainz.org/browse/MBS-13528?focusedId=73031&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-73031