diff --git a/newtests/lsp/detailed_diagnostics/test.js b/newtests/lsp/detailed_diagnostics/test.js
index e76ecc81b66..3f45b68cfc0 100644
--- a/newtests/lsp/detailed_diagnostics/test.js
+++ b/newtests/lsp/detailed_diagnostics/test.js
@@ -4,6 +4,7 @@
  */
 
 import type {SuiteType} from '../../Tester';
+const {readFileSync} = require('fs');
 const {join} = require('path');
 const {suite, test} = require('../../Tester');
 
@@ -24,6 +25,25 @@ module.exports = (suite(
         initializationOptions: {detailedErrorRendering: true},
       }),
       addFile('file_with_simple_error.js')
+        .waitUntilLSPMessage(
+          9000,
+          'textDocument/publishDiagnostics',
+          '{Cannot assign}',
+        )
+        .verifyLSPMessageSnapshot(
+          join(__dirname, '__snapshots__', 'no-detailed-errors.json'),
+          ['window/showStatus', '$/cancelRequest'],
+        ),
+      lspNotification('textDocument/didOpen', {
+        textDocument: {
+          uri: '<PLACEHOLDER_PROJECT_URL>/file_with_simple_error.js',
+          languageId: 'javascript',
+          version: 1,
+          text: readFileSync(
+            join(__dirname, 'file_with_simple_error.js'),
+          ).toString(),
+        },
+      })
         .waitUntilLSPMessage(
           9000,
           'textDocument/publishDiagnostics',
diff --git a/src/common/flow_lsp_conversions.ml b/src/common/flow_lsp_conversions.ml
index bb295fa68d6..33c2c577757 100644
--- a/src/common/flow_lsp_conversions.ml
+++ b/src/common/flow_lsp_conversions.ml
@@ -234,7 +234,7 @@ let position_of_document_position { Lsp.TextDocumentPositionParams.position; _ }
 let diagnostics_of_flow_errors =
   let error_to_lsp
       ~unsaved_content
-      ~vscode_detailed_diagnostics
+      ~should_include_vscode_detailed_diagnostics
       ~(severity : Severity.severity)
       (printable_error : Loc.t Flow_errors_utils.printable_error) :
       (Lsp.DocumentUri.t * Lsp.PublishDiagnostics.diagnostic) option =
@@ -253,7 +253,7 @@ let diagnostics_of_flow_errors =
           ~f:related_to_lsp
       in
       let data =
-        if vscode_detailed_diagnostics then
+        if should_include_vscode_detailed_diagnostics printable_error then
           let map_color = function
             | Tty.Default -> Lsp.PublishDiagnostics.ExtraDetailedDiagnosticV0.Default
             | Tty.Black -> Lsp.PublishDiagnostics.ExtraDetailedDiagnosticV0.Black
@@ -306,9 +306,11 @@ let diagnostics_of_flow_errors =
         )
     | Error _ -> None
   in
-  fun ~unsaved_content ~vscode_detailed_diagnostics ~errors ~warnings ->
+  fun ~unsaved_content ~should_include_vscode_detailed_diagnostics ~errors ~warnings ->
     let add severity error acc =
-      match error_to_lsp ~unsaved_content ~vscode_detailed_diagnostics ~severity error with
+      match
+        error_to_lsp ~unsaved_content ~should_include_vscode_detailed_diagnostics ~severity error
+      with
       | Some (uri, diagnostic) -> Lsp.UriMap.add ~combine:List.append uri [diagnostic] acc
       | None -> acc
     in
diff --git a/src/server/command_handler/commandHandler.ml b/src/server/command_handler/commandHandler.ml
index 0803370cbe4..d08ee86bc2e 100644
--- a/src/server/command_handler/commandHandler.ml
+++ b/src/server/command_handler/commandHandler.ml
@@ -3601,7 +3601,8 @@ let handle_live_errors_request =
             let live_diagnostics =
               Flow_lsp_conversions.diagnostics_of_flow_errors
                 ~unsaved_content:(Some (File_path.make file_path, content))
-                ~vscode_detailed_diagnostics:(vscode_detailed_diagnostics client)
+                ~should_include_vscode_detailed_diagnostics:
+                  (Base.Fn.const (vscode_detailed_diagnostics client))
                 ~errors:live_errors
                 ~warnings:live_warnings
               |> Lsp.UriMap.find_opt live_errors_uri
diff --git a/src/server/persistent_connection/persistent_connection.ml b/src/server/persistent_connection/persistent_connection.ml
index 9184dcb6f50..ccb36ea4902 100644
--- a/src/server/persistent_connection/persistent_connection.ml
+++ b/src/server/persistent_connection/persistent_connection.ml
@@ -108,10 +108,20 @@ let send_errors =
         Lsp.Initialize.(client.lsp_initialize_params.initializationOptions.detailedErrorRendering)
         ~default:false
     in
+    let should_include_vscode_detailed_diagnostics =
+      if vscode_detailed_diagnostics then
+        fun error ->
+      let open Flow_errors_utils in
+      match loc_of_printable_error error |> Loc.source with
+      | None -> false
+      | Some source -> SMap.mem (File_key.to_string source) client.opened_files
+      else
+        Base.Fn.const false
+    in
     let diagnostics =
       Flow_lsp_conversions.diagnostics_of_flow_errors
         ~unsaved_content:None
-        ~vscode_detailed_diagnostics
+        ~should_include_vscode_detailed_diagnostics
         ~errors
         ~warnings
     in