NullReferenceException is thrown when toggling Exclusion of a Category Query Block in the Shader Graph Template Browser Window

Steps to reproduce:

1. Create a URP 3D Project
2. In the Project Browser create a Shader Graph "From Template"
3. In the Template Window's Search add 2 Category Query Blocks divided by an OR Operator
4. While holding CTRL click on the first Category Block then on the Second one to Exclude them
5. Then in quick succession while holding CTRL click the first Category Query Block 10 times

Actual results: Error "NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Search.BaseAsyncIEnumerableHandler`1[T].FetchSome (System.Collections.Generic.List`1[T] items, System.TimeSpan maxFetchTime) (at <2ffcd6fda4e74d5a8a00f3963e74bc6b>:0)
UnityEditor.Search.BaseAsyncIEnumerableHandler`1[T].Update " will be logged

Expected results: No Errors are logged when toggling Exclusion on a Query Block

Reproducible with versions: 6000.5.0a5, 6000.5.0b10, 6000.6.0a6

Cannot test with versions: 6000.0.76f1, 6000.3.16f1, 6000.4.9f1, 6000.5.0a4 (No Search In Template Windows)

Tested on (OS): Windows 11

Note: Issue reproduces around 1/10 times