[Bug] CI BVT fulltext2_copy_alter misses expected rows

## Problem

The CI BVT case `fulltext2/fulltext2_copy_alter.sql` returns an incomplete result on the current base.

Observed in [PR #28976](https://github.com/matrixorigin/matrixone/pull/28976), run [35060323150](https://github.com/matrixorigin/matrixone/actions/runs/35060323150).

At row 93:

Expected:
```
id[-5,64,0]
100
101
```

Actual:
```
id[-5,64,0]
```

The PR changes only `optools` race-UT scheduling and does not touch fulltext execution or this BVT case, so this is being tracked as a base/shared BVT regression.

## Requested investigation

1. Reproduce the failure on the current base.
2. Check whether the copied/altered fulltext index or query result loses rows 100 and 101.
3. Add or update a focused regression test, then restore the BVT expectation.