Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. Add the attached "EntityIdHolder.cs" script to the Assets folder
3. In Hierarchy create Empty GameObject (Right-click > Create Empty)
4. In Inspector press "Add Component" and add "Entity Id Holder"
5. Observe that "Entity Ids" is shown as a single number field with value "0"
6. Click on the "Entity Ids" field, enter "5" and press Enter
7. Observe the Editor

Actual results: "The file 'MemoryStream' is corrupted! Remove it and launch unity again!" error is thrown and the Editor closes

Expected results: Entity Ids" is shown as a list, the entered value is applied and the Editor keeps running

Reproducible with versions: 6000.3.28f1, 6000.6.8f1, 6000.7.0b7, 7000.0.0a12

Can’t test with versions: 6000.0.84f1 (No EntityId type)

Tested on (OS): macOS 27 (M1)

[Position out of bounds!]
UnityEngine_CoreModule_ProxyFunctionPointers.UnityEngine_StackTraceUtility_ExtractStackTrace_UnmanagedCallers(ManagedSpanWrapper*, IntPtr)
UnityEditor.GUIView.ProcessEvent(EntityId, IntPtr, Boolean&) in /Users/bokken/build/output/unity/unity/Editor/Mono/GUIView.cs:line 100
UnityEditor_CoreModule_ProxyFunctionPointers.UnityEditor_GUIView_ProcessEvent_UnmanagedCallers(UInt64*, IntPtr, Byte*, IntPtr)