New odd behavior with transaction filtering

[Jack]

I have a local vendor called "Cash True Value" which is listed in the  
memo, but I use "True Value" for the payee.
I was just looking at that (credit card) account in the ledger, I typed  
Ctl-F and typed "cash" in the search box.  The display did not change  
at all - even though "cash" does not appear in very many of the  
transactions.  If I add a space ("cash ") it filters as expected.  If I  
remove that space, it appears there is no filtering applied.  All other  
things I type in the search box seem to filter as expected.  Is there  
anything magic about that word?

Jack