When you make a search and you run out of credit, if the searched term contains an hashtag, everything that comes after it is going to be deleted from the query if you search it elsewhere on Google or Bing.
For example, if my search was "hello#world", the search on google/bing is going to be just "hello"
I'd expect the search on google/bing to be exactly the same as what I typed in Kagi's search bar