node: wrong state root after 100 blocks unwind

While using the `staged_pipeline` utility to check the unwind procedure on mainnet, this sequence of commands:
```
staged_pipeline --exclusive --datadir ~/silkworm reset_to_download --keep_senders --force
staged_pipeline --exclusive --datadir ~/silkworm debug_unwind --height 1000000 --stop_before_stage HistoryIndex --step 100 --force
```
produces a state root mismatch at the end of InterHashes stage:
```
INFO [12-13|23:35:57.238 UTC] Debug unwind datadir: ~/silkworm
INFO [12-13|23:36:03.298 UTC] Reopen snapshot repository folder: ~/silkworm/snapshots
INFO [12-13|23:36:05.043 UTC] Total reopened bundles: 72 max block available: 20'474'999
INFO [12-13|23:36:05.043 UTC] Debug unwind: forward to=1'000'000 START
INFO [12-13|23:36:05.043 UTC] ExecutionPipeline Forward start
INFO [12-13|23:36:05.043 UTC] [5/13 Execution] op=kForward from=0 to=1000000 span=1000000
INFO [12-13|23:36:35.045 UTC] [5/13 Execution] block=808791 blocks/s=26959 txns/s=37191 Mgas/s=1525
INFO [12-13|23:36:48.233 UTC] Flushed state size=41.53 MB in=597.315ms
INFO [12-13|23:36:48.489 UTC] [5/13 Execution] commit batch time=254.726ms
INFO [12-13|23:36:48.490 UTC] [5/13 Execution] op=Forward done=43.446s
INFO [12-13|23:36:48.490 UTC] [6/13 HashState] op=kForward from=0 to=1000000 span=1000000
INFO [12-13|23:36:48.490 UTC] [6/13 HashState] clearing=HashedAccount
INFO [12-13|23:36:48.490 UTC] [6/13 HashState] clearing=HashedStorage
INFO [12-13|23:36:48.490 UTC] [6/13 HashState] clearing=HashedCodeHash
INFO [12-13|23:36:49.177 UTC] [6/13 HashState] op=Forward done=686.119ms
INFO [12-13|23:36:49.177 UTC] [7/13 IntermediateHashes] begin op=kForward from=0 to=1000000 span=1000000
INFO [12-13|23:36:49.177 UTC] [7/13 IntermediateHashes] clearing=TrieAccount
INFO [12-13|23:36:49.177 UTC] [7/13 IntermediateHashes] clearing=TrieStorage
INFO [12-13|23:36:49.696 UTC] [7/13 IntermediateHashes] op=Forward done=519.858ms
WARN [12-13|23:36:49.696 UTC] Stopping ... STOP_BEFORE_STAGE=HistoryIndex hit=true
INFO [12-13|23:36:49.697 UTC] ExecutionPipeline Forward done
INFO [12-13|23:36:49.697 UTC] Debug unwind: forward to=1'000'000 END
INFO [12-13|23:36:49.697 UTC] Debug unwind: unwind down to block=999'900 START
INFO [12-13|23:36:49.697 UTC] ExecutionPipeline Unwind start
INFO [12-13|23:36:49.697 UTC] [7/13 HashState] op=kUnwind from=1000000 to=999900 span=100
INFO [12-13|23:36:49.707 UTC] [8/13 IntermediateHashes] begin op=kUnwind from=1000000 to=999900 span=100
ERROR [12-13|23:36:49.720 UTC] Wrong trie root expected=0x33d8f415fd268da5169ac45e5f8e07fe710c23e4f4e2a318a9f781bd196f2066 got=0xd418c5ebada98e1a1bad2cec92153ca2baaa6cb6a543b23ae4968307b7192bc9
ERROR [12-13|23:36:49.720 UTC] [8/13 IntermediateHashes] function=unwind exception=kWrongStateRoot
ERROR [12-13|23:36:49.720 UTC] [8/13 IntermediateHashes] op=Unwind returned=kWrongStateRoot
ERROR [12-13|23:36:49.720 UTC] ExecutionPipeline Unwind interrupted due to stage IntermediateHashes failure
Error: unwind failed: kWrongStateRoot
```