iavl export failed with "version does not exist"

[yihuang]

$ ./build/cronosd snapshots export --height 8200000 --home /tmp/test1
Exporting snapshot for height 8200000
Error: failed to generate snapshot chunk 262: iavl export failed for version 8200000: version does not exist

I'm testing the local snapshot import/export, and meet above error, iavl release/0.19.x, cosmos-sdk release/v0.46.x.
It's been running for 10 hours and generated most of chunks, then quit with above error at chunk 262.

[yihuang]

I guess because one of the stores is empty, will investigate later.

[yihuang]

it's probably because I didn't downgrade goleveldb dependency.