How to reproduce:
1. Open the user’s attached “CurveEditorIssue-2022.3.4.zip” project
2. In the Hierarchy window select “MyCurve” GameObject
3. In the Inspector window click on a green curve
4. In the Curve window left click or right click on a keyframe
5. Observe the result

Expected result: When left-clicking keyframe is selected. When right-clicking multiple options in the context menu are available (Delete Key, Edit key, Clamped Auto, Auto, Free Smooth…)
Actual result: When left-clicking keyframe is not selected. When right-clicking the context menu has just the “Add Key” option

Reproducible with: 2022.3.4f1, 2023.2.0a21, 2023.2.0a22
Not reproducible with: 2021.3.28f1, 2022.3.3f1, 2023.1.3f1, 2023.2.0a20

Reproducible on: macOS 13.2.1 (Intel), Windows 11

Notes:
selection works with click and drag
reproducible with curves in different areas like Animation Curves, Particle System Curves