Inspector controls doesn't work in 2022+

[dragon122]

Any actions with the "+s""+i" buttons in the inspector are ignored in 2022LTS\2023

[hackerG7]

Same here

[wozhdal]

same (2022.3.30f1)

found something : when hit +i or +s, remove button is called at the same time.
i tried to remove the remove button and +i and +s show a new item as planned.

But, when trying to add a method, another issue appear, the dropdown is empty and this error pop up:
System.NullReferenceException: Object reference not set to an instance of an object bool UnityEngine.GUI.DoControl(Rect position, int id, bool on, bool hover, GUIContent content, GUIStyle style) bool UnityEngine.GUI.DoButton(Rect position, int id, GUIContent content, GUIStyle style) bool UnityEngine.GUI.Button(Rect position, int id, GUIContent content, GUIStyle style) x 2 bool SolidUtilities.GUIHelper.CloseButton(Rect buttonRect) in ./Library/PackageCache/com.solidalloy.util@1.40.0/Runtime/Helpers/GUIHelper.cs:26 string UnityDropdown.Editor.DropdownMenu.DrawSearchField(Rect innerToolbarArea, string searchText) in ./Library/PackageCache/com.solidalloy.unity-dropdown@1.2.0/Editor/DropdownMenu.cs:211

I tried to add this pull request of dropdown supporting unity 2022: https://github.com/SolidAlloy/UnityDropdown/pull/3/files#diff-81cda7c4db1f47564e3c1eea4b7178c037137e20216f1920286404c139cb0a90

i tried to correct the error at GUIHelper.cs:26 with this modification :
return GUI.Button(buttonRect, GUIContent.none, new GUIStyle());
and the dropdown seems now to work.

[dragon122]

Nice find.
It seems that the reason the list was cleared on any input was because during the check with ButtonData.IsAddButton == false at FoldoutList.DrawFooter the button press was invoked constantly (list.ScheduleRemove is always true?). So, to fix the button was enough to replace false to true in FoldoutList.DefaultRemoveButton at 281 line.

[Oxydiz]

The root cause is inside Editor/Util/FoldoutList.cs

The code hooks into Unity's internal code to get the value of scheduleRemove. But the underlying field has been renamed and its visibilty was also updated, so instead of doing
typeof(ReorderableList).GetField("scheduleRemove", BindingFlags.NonPublic | BindingFlags.Instance);
we need to do
typeof(ReorderableList).GetField("m_scheduleRemove", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);

I know I'm late but I hope this helps