test: fix intermittent feature blockfile assertion #34494

1. 
   b-l-u-e commented at 8:20 pm on February 3, 2026: contributor

   intermittent feature_assumeutxo.py failures were a race with -fastprune 64 KiB blockfiles, the normal chainstate can fill blk00000.dat and roll to blk00002.dat while the snapshot chainstate writes blk00001.dat before -stopatheight trips…the test now tolerates blk00002.dat and logs when it appears the behavior remains unchanged, so we just stop failing on a benign rollover.. i believe this should fix #33635
2. test: fix intermittent feature blockfile assertion ebe4bfec03
3. DrahtBot added the label Tests on Feb 3, 2026
4. 
   DrahtBot commented at 8:21 pm on February 3, 2026: contributor

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5. DrahtBot added the label CI failed on Feb 3, 2026
6. DrahtBot removed the label CI failed on Feb 4, 2026

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