[Bug] Copilot sometimes makes changes, but then says that the changes

Environment

• OS: Windows 11 25H2
• Eclipse Version: 2025-06
• Plugin Version: 0.16.0.202604020254

Describe the bug
When using Agent mode to edit files using Claude sonnet 4.6 (though I have noticed it with other models as well), Copilot first says "I'm going to do X", then performs the necessary changes, but then re-reads the file and sees that the changes has already been made, and then it reads the file multiple times to verify what's going on, only to try and gaslight me by saying the file was originally already in the final state. To be clear: the change does get made, but Copilot thinks the final state was how the file originally already was.

To Reproduce
Steps to reproduce the behavior:

1. Ask Copilot to make a change to a file, like inserting an extra layer of divs inside a document tree.

Expected behavior
I expect Copilot to not pretend like it didn't need to edit the file, and instead say that it has edited the file according to my request.

Screenshots

Additional context
Add any other context about the problem here.

Reproduce the issue in Eclipse 2025-06 with Copilot plugin 0.16.0.202604020254 using Agent mode and a request that edits a file, such as inserting nested divs. Observe the edit and subsequent file reads; done means Copilot accurately reports that it changed the file instead of claiming the final state was present originally.