Multiple extension recommendation modals stack and overlap when workbench.editor.useModal is enabled

Does this issue occur when all extensions are disabled?: Yes

- VS Code Version: 1.128.0
- OS Version: Windows 11 Pro

Steps to Reproduce:

1. Set `"workbench.editor.useModal"`: `"some"` (or `"all"`).
2. Open a workspace with multiple recommended extensions in `.vscode/extensions.json.`

Actual Behavior
Multiple modals spawn simultaneously and stack directly on top of each other. Their semi-transparent backdrops compound, causing overlapping, unreadable UI layers, see the video below.

Expected Behavior
Modals should not be shown stacked on each other and semi-transparent like that.