fix(meta): fix trivial move bug

[Little-Wallace]

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What's changed and what's your intention?

The trivial move may reach target sub level before a large task running in compactor and it will cause can_concat check fail

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[hzxa21]

Given that we believe the bug is introduced a while ago and it will not impact correctness, I think it is okay to include it in the next 1.8 release instead.