Invalid Threads
 

If possible, when the administrators have decided to remove a thread, could that link to the invalid thread not show up in the digest? Quite frustrating to hit three in a row under a single section. Thanks!

the digest lists do not update themselves.
moderators could not be reasonably expected to manually update them.

those lists are also never up-to-date in the first place.
they don't include the newest threads ... just the busiest.