Multi-diff button for current pull request is gone

[anonpay-sh]

• Extension version: 0.126.0
• VSCode Version: 1.108.0
• OS: Darwin arm64 25.2.0
• Repository Clone Configuration (single repository/fork of an upstream repository): single repository (e.g. this one, https://github.com/microsoft/vscode-pull-request-github.git)
• GitHub Product (GitHub.com/GitHub Enterprise version x.x.x): GitHub.com

Steps to Reproduce:

1. Check out a pull request.
2. Select the GitHub Pull Request tab in the left navigation bar.
3. Observe that when hovering over the title of the pull request, the multi-diff button is no longer present.

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Expected behavior:

Up until recently, when hovering over the title of the pull request in the left sidebar (or when that line had focus), there was a multi-diff button you could click to open a multi-diff for the current pull request.

For example, here's a frame from the demo GIF on https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github showing that this button (the one with the ± symbol) was present in a previous version of the extension, along with a button you could click to open the pull request description.

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Actual behavior:

After a recent update, when hovering over the title of the pull request in the left sidebar, no buttons are shown anymore. In particular, I no longer see a way to open a multi-diff.

Here's an example using one of the latest pull requests from this repository. Observe that both of the buttons from the previous screenshot are gone.

Why was the multi-diff button removed? Would it be possible to restore it?