Last modified: 2006-06-04 00:21:59 UTC
If a template contains, say {{{Param|default}}}, and if the subst'ed template did not have a 'Param' parameter, subst:template will insert "{{{Param|default}}}" in the wikimarkup instead of "default" as I'd expected. This isn't a problem (currently), but it looks pretty silly. And I doubt this feature was intentional. The other problem described on the url is already in another PR.
This seems to have been fixed some time in the last months.