Fix Log family table return wrong rows count after truncate

[ucasfl]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix Log family table return wrong rows count after truncate. Closes #50578.

[robot-clickhouse-ci-1]

This is an automated comment for commit ef1898d with description of existing statuses. It's updated for the latest CI running
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The overall status of the commit is 🔴 failure

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[tavplubix]

Stateless tests flaky check (asan) - the new test has failed

[tavplubix]

Integration tests (asan) [6/6] - #49400