TypeError: argument 'ids': 'list' object cannot be interpreted as an integer

When I trained Qwen3 using the provided instance, I encountered this error.

Start by reproducing the error with the provided Qwen3 training instance and capture the complete traceback, including the call site and relevant argument values. Trace where the `ids` argument is created and determine the expected type; done means the instance trains without this TypeError and the behavior is covered by an appropriate regression test.

Written by the indexing model from the issue text.