Steps to reproduce:
1. Open the attached user's project "MultiSelectIssue.zip"
2. Open "Scenes/SampleScene.unity"
3. Select both Enum1 and Enum2 GameObjects in the Hierarchy
4. Try to set the "Fruit" property in the Inspector to "Banana." It will not work, because the second GameObject's Fruit property is already "Banana."
5. Observe that setting the "Fruit" property to "Apple" or "Cherry" does change both objects as intended
6. Repeat with multi-selecting "Popup1" and "Popup2" to observe the issue occurring with custom Property Drawers

Expected results: When Multi-editing GameObjects with Seriliazed Enum fields changes are reflected if the the last selected GameObject in the Hierarchy has a different value
Actual results: When Multi-editing GameObjects with Seriliazed Enum fields, changes are not reflected if the the last selected GameObject in the Hierarchy has a different value

Reproducible on: 2021.3.27f1, 2022.3.2f1, 2023.1.1f1, 2023.2.0a20

Tested environment: windows 10

Notes:
-This issue occurs whether using Unity's default enum property drawer, or using EditorGUI.Popup to create a custom