Tag spaces treated inconsistently.

I have been having problems with how spaces within tags are handled since Gnolia's relaunch. To use a single example, I have several imported bookmarks tagged with "monty_python" that I tried renaming to "monty python" using the tag editor.

The tag subsequently appeared as "monty python" when I browse through my bookmarks. However, it appears as "montypython" in several other places:
1. My tag cloud, both after I changed the tag and on subsequent viewings.
2. Tag autofill in the bookmarklets.
3. The exported bookmarks file. Here, the tags with dropped spaces include subsequent bookmarks that I've tagged as "monty python" by hand.

I've seen spaces dropped from other tags that I renamed in a similar way, plus new tags with spaces that I've created since then.