How to reproduce:
1. Create a new Unity project
2. Create a new C# script, but don't finish naming it
3. Instead of renaming it or pressing Enter, click on the icon of the script or click on an empty space in the Project window

Expected result: the scripts are recompiled immediately(as seen at the bottom right of the Editor)
Actual result: scripts are not recompiled immediately

Reproducible with: 2021.1.0a5 2021.1.0b1, 2021.2.0a1
Not reproducible with: 2018.4.30f1, 2019.4.16f1, 2020.1.17f1, 2020.2.1f1, 2021.1.0a4

Notes:
Only reproducible on Windows
If the issue does not occur at first, delete the script/asmdef and try again from step 2
Because of delayed compilation, creating new Assets can result in a NullReferenceException from UnityEditor.PropertyEditor.DrawEditors(to reproduce, create Assembly Definitions instead of C# scripts in steps 2-3, delete them after each attempt)

Exception:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.PropertyEditor.DrawEditors (UnityEditor.Editor[] editors) (at <20090764902e4293871cd9b1a16b42f1>:0)
UnityEditor.PropertyEditor.RebuildContentsContainers () (at <20090764902e4293871cd9b1a16b42f1>:0)
UnityEditor.InspectorWindow.OnSelectionChanged () (at <20090764902e4293871cd9b1a16b42f1>:0)
UnityEditor.Selection.Internal_CallSelectionChanged () (at <20090764902e4293871cd9b1a16b42f1>:0)