Go to Tiddlywiki dot com.
Search and open tiddler “abs Operator (Examples)”
In the tag drop down, type “wor” (without the quotes) and you will see two matches. Click to save the tiddler and you will see there is a new tag “wor”. Edit the tiddler again and delete the “wor” tag. Now click into the tag drop down. It will still show the two tiddlers that are a hit for “wor”. Close to save the tiddler and then edit again. When you click in the tag box, it is still showing the same two tiddlers, even though there is nothing to search for.
To clear this, you will have to start a new search, or click on the X to clear the search.
Tested on Chromium and Firefox under Linux.