diff --git a/backend/Testing/ApiTests/ApiTestBase.cs b/backend/Testing/ApiTests/ApiTestBase.cs
index 89db65d10..fd448361c 100644
--- a/backend/Testing/ApiTests/ApiTestBase.cs
+++ b/backend/Testing/ApiTests/ApiTestBase.cs
@@ -60,4 +60,10 @@ public async Task StartLexboxProjectReset(string projectCode)
         var response = await HttpClient.PostAsync($"{BaseUrl}/api/project/resetProject/{projectCode}", null);
         response.EnsureSuccessStatusCode();
     }
+
+    public async Task InvalidateDirCache(string projectCode)
+    {
+        var response = await HttpClient.PostAsync($"{BaseUrl}/hg/command/{projectCode}/invalidatedircache", null);
+        response.EnsureSuccessStatusCode();
+    }
 }
diff --git a/backend/Testing/SyncReverseProxy/SendReceiveServiceTests.cs b/backend/Testing/SyncReverseProxy/SendReceiveServiceTests.cs
index b2b927a85..c0a5ad230 100644
--- a/backend/Testing/SyncReverseProxy/SendReceiveServiceTests.cs
+++ b/backend/Testing/SyncReverseProxy/SendReceiveServiceTests.cs
@@ -117,7 +117,7 @@ public async Task SendReceiveAfterProjectReset(HgProtocol protocol)
         var projectConfig = _srFixture.InitLocalFlexProjectWithRepo(protocol, "SR_AfterReset");
         await using var project = await RegisterProjectInLexBox(projectConfig, _adminApiTester);
 
-        await WaitForHgRefreshIntervalAsync();
+        await _adminApiTester.InvalidateDirCache(projectConfig.Code);
 
         var sendReceiveParams = new SendReceiveParams(protocol, projectConfig);
         var srResult = _sendReceiveService.SendReceiveProject(sendReceiveParams, AdminAuth);
@@ -144,7 +144,7 @@ public async Task SendReceiveAfterProjectReset(HgProtocol protocol)
         await _adminApiTester.HttpClient.PostAsync($"{_adminApiTester.BaseUrl}/api/project/resetProject/{projectConfig.Code}", null);
         await _adminApiTester.HttpClient.PostAsync($"{_adminApiTester.BaseUrl}/api/project/finishResetProject/{projectConfig.Code}", null);
 
-        await WaitForHgRefreshIntervalAsync(); // TODO 765: Remove this
+        await _adminApiTester.InvalidateDirCache(projectConfig.Code);
 
         // Step 2: verify project is now empty, i.e. tip is "0000000..."
         response = await _adminApiTester.HttpClient.GetAsync(tipUri.Uri);
@@ -169,7 +169,7 @@ public async Task SendReceiveAfterProjectReset(HgProtocol protocol)
         var srResultStep3 = _sendReceiveService.SendReceiveProject(sendReceiveParams, AdminAuth);
         _output.WriteLine(srResultStep3);
 
-        await WaitForHgRefreshIntervalAsync(); // TODO 765: Remove this
+        await _adminApiTester.InvalidateDirCache(projectConfig.Code);
 
         // Step 4: verify project tip is same hash as original project tip
         response = await _adminApiTester.HttpClient.GetAsync(tipUri.Uri);
diff --git a/frontend/tests/resetProject.test.ts b/frontend/tests/resetProject.test.ts
index 7ba084ffb..9e1354595 100644
--- a/frontend/tests/resetProject.test.ts
+++ b/frontend/tests/resetProject.test.ts
@@ -59,7 +59,7 @@ test('reset project and upload .zip file', async ({ page, tempProject, tempDir }
   await resetProjectModel.assertGone();
 
   // Step 4: confirm it's empty now
-  await page.request.get(`${testEnv.serverBaseUrl}/hg/command/${tempProject.code}/tip`); // Force an NFS cache clear, ignore result
+  await page.request.get(`${testEnv.serverBaseUrl}/hg/command/${tempProject.code}/invalidatedircache`); // Force an NFS cache clear
   const afterResetResponse = await page.request.get(`${testEnv.serverBaseUrl}/hg/${tempProject.code}/file/tip?style=json-lex`);
   const afterResetJson = await afterResetResponse.json() as HgWebJson;
   expect(afterResetJson.node).toEqual(allZeroHash);
@@ -78,12 +78,8 @@ test('reset project and upload .zip file', async ({ page, tempProject, tempDir }
   await resetProjectModel.assertGone();
 
   // Step 6: confirm tip hash and contents are same as before reset
-  // It can take a while for the server to pick up the new repo
-  await expect(async () => {
-    const afterUploadResponse = await page.request.get(`${testEnv.serverBaseUrl}/hg/${tempProject.code}/file/tip?style=json-lex`);
-    const afterResetJSon = await afterUploadResponse.json() as HgWebJson;
-    expect(afterResetJSon).toEqual(beforeResetJson); // NOT .toBe(), which would check that they're the same object.
-  }).toPass({
-    intervals: [1_000, 3_000, 5_000],
-  });
+  await page.request.get(`${testEnv.serverBaseUrl}/hg/command/${tempProject.code}/invalidatedircache`); // Force an NFS cache clear
+  const afterUploadResponse = await page.request.get(`${testEnv.serverBaseUrl}/hg/${tempProject.code}/file/tip?style=json-lex`);
+  const afterResetJSon = await afterUploadResponse.json() as HgWebJson;
+  expect(afterResetJSon).toEqual(beforeResetJson); // NOT .toBe(), which would check that they're the same object.
 });
diff --git a/hgweb/command-runner.sh b/hgweb/command-runner.sh
index fe66a1c77..56c5fa037 100644
--- a/hgweb/command-runner.sh
+++ b/hgweb/command-runner.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Define the list of allowed commands
-allowed_commands=("verify" "tip" "wesaylexentrycount" "lexentrycount" "recover")
+allowed_commands=("verify" "tip" "wesaylexentrycount" "lexentrycount" "recover", "invalidatedircache")
 
 # Get the project code and command name from the URL
 IFS='/' read -ra PATH_SEGMENTS <<< "$PATH_INFO"
@@ -63,6 +63,10 @@ case $command_name in
         timeout 5 chg verify 2>&1
         ;;
 
+    invalidatedircache)
+        # Do nothing; the ls before the case was the whole point of this command
+        ;;
+
     *)
         # Env var PYTHONUNBUFFERED required for commands like verify and recover, so that output can stream back to the project page
         PYTHONUNBUFFERED=1 chg $command_name 2>&1