Return ambiguous because of duplicate imports of unused package in sourceMode

[mmsqe]

Actual behavior A clear and concise description of what the bug is.

mockgen imports another package github.com/cometbft/cometbft/rpc/jsonrpc/types with same name while source only imports github.com/cometbft/cometbft/types, and ambiguous error occurs:

"types" is ambiguous because of duplicate imports: [github.com/cometbft/cometbft/types github.com/cometbft/cometbft/rpc/jsonrpc/types]

Expected behavior A clear and concise description of what you expected to
happen.

No error when generate mock file.

To Reproduce Steps to reproduce the behavior

#!/usr/bin/env bash

for i in {1..10}; do
    mockgen -source=client/v2/broadcast/comet/comet.go -package testutil -destination client/v2/broadcast/comet/testutil/comet_mock.go
done

Additional Information

• gomock mode (reflect or source): source
• gomock version or git ref: v0.5.0
• golang version: go1.23.3

Triage Notes for the Maintainers