Cannot apply modifications to the specified target file in a multi-file context

[graceyangfan]

When using the Composer API or editor integration in a multi-file context, modifications are incorrectly applied to File B instead of the intended target File A. This issue causes the following problems:

Prompt guidance does not take effect.
There is no way to manually specify the correct target file for applying changes.
Steps to Reproduce
Load two files, File A and File B, into the Composer/editor.
Specify modifications to be applied to File A via the API.
Observe that the modifications are incorrectly applied to File B.
Expected Behavior
The modifications should be applied to the user-specified target file, File A.

Actual Behavior
The modifications are incorrectly applied to File B, and there is no prompt or manual option to override the target.
cursor:v0.44.11