Quota is not reset after waiting RateLimit-Reset time

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

SharePoint CSOM

Developer environment

Windows

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• Microsoft.SharePointOnline.CSOM 16.1.22810.12000
• .NET 6

Describe the bug / error

While developing and testing the RateLimit headers which SharePoint online provides we noticed that the RateLimit-Reset value does not imply the number of seconds an app should wait before the quota is fully reset.

In the documentation https://learn.microsoft.com/en-us/sharepoint/dev/general-development/how-to-avoid-getting-throttled-or-blocked-in-sharepoint-online is stated that RateLimit-Reset value is the number of seconds before the quota is reset.

In our testing we see that after we wait the number of seconds specified by the RateLimit-Reset value the quota is not reset. In this example the quota is reset after 26 seconds instead of 5 seconds.

Steps to reproduce

1. Use the example provided by https://github.com/OneDrive/samples/blob/master/scenarios/throttling-ratelimit-handling/readme.md
2. Modify the following lines InitializeAndRunAsync() method in Demo.cs:

From:
parallelOps.Add(DoWork(j, client, sharePointAccessToken, graphAccessToken, 5000));

To:

                if (j == 0)
                {
                    parallelOps.Add(DoWork(j, client, sharePointAccessToken, graphAccessToken, 5000));
                }
                else
                {
		  parallelOps.Add(DoWork(j, client, sharePointAccessToken, graphAccessToken, 90));
		}

4. Use this RateLimiter.cs file (uploaded as txt file)
   RateLimiter.cs.txt

5. In Demo.cs we have changed the code of SharePointCSOMCallAsync() method to make a EnsureUser call to SharePoint online.

        private async Task SharePointCSOMCallAsync(Microsoft.SharePoint.Client.ClientContext clientContext)
        {
            // Make a CSOM call
            var refUserAsPrincipal = clientContext.Web.EnsureUser("ADSynctest-01"); // 2 punten
			clientContext.Load(refUserAsPrincipal, _user => _user.Email, _user => _user.LoginName);

			await clientContext.ExecuteQueryAsync();
			//clientContext.Load(clientContext.Web);
			//await clientContext.ExecuteQueryAsync();
			IncrementCallsDone();

            //Console.WriteLine(clientContext.Web.Title);
        }

6. In Demo.cs we commented out the following lines:

                // Test a SharePoint Rest call
               // await SharePointRestCallAsync(client, sharePointAccessToken);

                // Test a Graph Rest call
                //await GraphRestCallAsync(client, graphAccessToken);

7. Run the example

Expected behavior

We expect that after waiting the RateLimit-Reset value in seconds the quota is reset and the folllow up requests can go full throttle.