Normally interacting with the properties would trigger a reformat, but if you really have spaces to separate your Tags you’ll need to do some search and replace, or template action on them to change into a proper list of tags.
If on one line they need to be comma separated for Obsidian to reformat them into a proper list, if I’m not mistaken.
I didn’t try now but I’m guessing it should work, although I am again not sure how Linter would handle the comma-less situation…
The settings I have and would expect to work: