strange behavior for duplicate imports with imports_granularity="Module"

[xxchan]

e.g.,

use risingwave_batch::executor::{BoxedExecutor, JoinType};
use risingwave_batch::executor::{BoxedExecutor, JoinType};

After first fmt

use risingwave_batch::executor::{BoxedExecutor, BoxedExecutor, JoinType, JoinType};

After second fmt

use risingwave_batch::executor::{BoxedExecutor, JoinType, JoinType};

The behavior I want is that it can remove duplicates, like imports_granularity="Crate"

[ytmimi]

Confirming I can reproduce this when building from source using rustfmt 1.7.1-nightly (7cdb426 2024-07-15). Linking the tracking issue for imports_granularity (#4991)