Reproduction steps:
1. Open the attached "FoldoutHeaderGroup.zip" project
2. Open the "SampleScene" Scene
3. In the Hierarchy, select the "Subject" GameObject
4. In the Inspector, expand the "Base Settings" FoldoutHeaderGroup

Expected result: All Lists show error because they are created the same way
Actual result: Only the first List ("List 1") errors with "You can't nest Foldout Headers, end it with EndHeaderFoldoutGroup."

Reproducible with: 2020.2.0b3, 2020.3.13f1, 2021.1.14f1, 2021.2.0b2, 2022.1.0a1
Not reproducible with: 2019.4.28f1, 2020.2.0b2

Note:
- Reproducible with Arrays too
- In the error that the "List 1" property displays, "EndHeaderFoldoutGroup" should be called "EndFoldoutHeaderGroup"
- Could not test with 2018.4.36f1 because EditorGUILayout did not contain a definition for BeginFoldoutHeaderGroup/EndFoldoutHeaderGroup