Create a topic called TLA and save it.
Now enter the "more topic actions" and move the topic to another web.
Now view the moved topic and click the "put it back" link at the bottom.
You now get an error message that you cannot do anything about.
Only way to put the topic back is the long way using "more topic actions" again.
I ran into this because we needed to move about 200 Acronym topics to a new Acronym web and because we have links everywhere to them I have to move them in TWiki so we get all the links updated.
I fixed the problem with a small modification of Render.pm.
I simply check the nonwikiword option in the "put it back" link. If a topic is already is - or was - a non-wikiword there is no reason to put any restrictions on putting it back to the old location or old name.
If a vandal moves topics around for the fun of it it also has to be possible quickly to put it back where it came from.