XF 2.1 Batch update threads don't found all Threads

Hello. I have problem with Batch update threads. I can't found all Threads. A Forum has 100 Threads and i can found only 20. I use not filter. I think its a Bug. With Version 2.0 work it fine.
 
Ensure the “First post reaction score” fields are both empty and try again. This is something we’ve changed for the next release.
 
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