How to reproduce:
1. Open the “AddressablesReleaseBug“ project
2. Open the “SampleScene”
3. Open the TestRunner window (Window → General → TestRunner)
4. Press “Run All” button
5. Observe that all of the tests failed
6. Open the “NewTestScript” script (Assets → Tests → NewTestScript.cs)
7. Comment out following lines of code under the DemonstrateAddressablesLoadReleaseBug function:

{{//Load 1}}
{{var handle1 = Addressables.LoadAssetAsync<TextAsset>("TestAsset.txt");}}
{{Assert.IsTrue(handle1.IsValid());}}
{{handle1.WaitForCompletion();}}
{{Assert.IsTrue(handle1.IsDone);}}

{{// Free 1}}
{{SafeRelease(handle1);}}
{{Assert.IsFalse(handle1.IsValid());}}

8. Repeat steps 3 and 4
9. Observe that all of the tests succeeded

Expected result: Addressables.release on the same asset should abide by the reference count on it and each handle should be able to be released only once to avoid confusion
Actual result: Addressables.release on the same asset does not follow the reference count on it and each handle is able to be released more than once so there is a need to monitor the isValid boolean flag to invalidate before releasing

Reproducible in: 2021.3.38f1, 2022.3.28f1, 6000.0.1f1

Reproduced on: Windows 10, macOS 14.4 (M1)
Not reproduced on: No other environments tested