Wildcards are allowed from 6.x onwards as far as I know, but the tags still does not show in the field discovery panel.
I suspect that the field discovery panel receive its collection of fields before the tags are added to the event. The best is to log a Case with Splunk if you have a Support Contract.
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I got these on old hardware when I upgraded to 6.1.3. It appears to be a timing issue and storage speed appears to play a role. Take a look at this thread.
http://answers.splunk.com/answers/12666/42-search-head-asynchronous-bundle-replication-error
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