diff --git a/source/Handlebars.Test/BasicIntegrationTests.cs b/source/Handlebars.Test/BasicIntegrationTests.cs
index d5211f82..5890f4cb 100644
--- a/source/Handlebars.Test/BasicIntegrationTests.cs
+++ b/source/Handlebars.Test/BasicIntegrationTests.cs
@@ -991,6 +991,21 @@ public void DictionaryEnumeratorWithBlockParams(IHandlebars handlebars)
             Assert.Equal("hello foo world bar ", result);
         }
 
+        [Theory, ClassData(typeof(HandlebarsEnvGenerator))]
+        public void BlockParamsNamedLikeContextVariables(IHandlebars handlebars)
+        {
+            // Block params sharing a name with @-variables used to be looked up by the @-variable's slot in a
+            // different dictionary, so whether they resolved depended on the process's string hash seed.
+            var data = new { items = new List<string> { "a", "b" } };
+
+            foreach (var name in new[] { "index", "key", "first", "last", "root", "parent" })
+            {
+                var template = handlebars.Compile($"{{{{#each items as |item {name}|}}}}{{{{{name}}}}}:{{{{item}}}};{{{{/each}}}}");
+
+                Assert.Equal("0:a;1:b;", template(data));
+            }
+        }
+
         [Theory, ClassData(typeof(HandlebarsEnvGenerator))]
         public void DictionaryWithLastEnumerator(IHandlebars handlebars)
         {
diff --git a/source/Handlebars/BindingContext.cs b/source/Handlebars/BindingContext.cs
index 42b1b38b..0240f1e7 100644
--- a/source/Handlebars/BindingContext.cs
+++ b/source/Handlebars/BindingContext.cs
@@ -147,14 +147,9 @@ out WellKnownVariables[(int) WellKnownVariable.Parent]
 
         internal bool TryGetVariable(ChainSegment segment, [MaybeNullWhen(false)] out object value)
         {
-            if (segment.WellKnownVariable != WellKnownVariable.None)
-            {
-                var wellKnownVariable = WellKnownVariables[(int) segment.WellKnownVariable];
-                return BlockParamsObject.TryGetValue(wellKnownVariable, out value) 
-                       || (Descriptor.Value.MemberAccessor?.TryGetValue(Value!, segment, out value) ?? false);
-            }
-            
-            return BlockParamsObject.TryGetValue(segment, out value) 
+            // Block params are looked up by segment even for well-known names (e.g. `as |item index|`):
+            // WellKnownVariables holds entry indexes into ContextDataObject, not BlockParamsObject.
+            return BlockParamsObject.TryGetValue(segment, out value)
                    || (Descriptor.Value.MemberAccessor?.TryGetValue(Value!, segment, out value) ?? false);
         }