Reproduction steps:

# Open the “TimelineRepro” project
# Open “SampleScene” scene
# Open Timeline window by Windows → Sequencing → Timeline
# In Hierarchy select “Main Camera” GameObject
# In the Timeline window while holding CTRL click on the “Control Track” track, “Square” and “Square (1)” on the timeline
# Deselect objects by clicking outside of the Control Track timeline
# In the Timeline window select “Square” or “Square (1)”
# Observe the Inspector

Expected result: No prompts in the Inspector
Actual result: Prompt in the Inspector - “Components that are only on some of the selected objects cannot be multi-edited”

Reproducible with: 1.7.1 (2022.1.0a12, 2022.1.12f1, 2022.2.0b3, 2023.1.0a4)
Not reproducible with: 1.4.8 (2020.3.37f1), 1.6.4 (2021.3.7f1), 1.7.0-pre.2, 1.7.0 (2022.1.0a11)

Reproduced on: Windows 10

Note: The problem is probably contained in the editor rather than in the package