diff --git a/lua/mason-core/installer/registry/init.lua b/lua/mason-core/installer/registry/init.lua
index 6b03296f4..9373f8d07 100644
--- a/lua/mason-core/installer/registry/init.lua
+++ b/lua/mason-core/installer/registry/init.lua
@@ -132,7 +132,7 @@ function M.parse(spec, opts)
         log.trace("Parsed source for purl.", source.id, parsed_source)
         return {
             provider = provider,
-            source = parsed_source,
+            source = vim.tbl_extend("keep", parsed_source, source),
             raw_source = source,
             purl = purl,
         }
@@ -204,7 +204,6 @@ function M.compile(spec, opts)
                 ctx.receipt:with_primary_source {
                     type = ctx.package.spec.schema,
                     id = Purl.compile(parsed.purl),
-                    source = parsed.source,
                 }
             end):on_failure(function(err)
                 error(err, 0)
diff --git a/tests/mason-core/installer/registry/installer_spec.lua b/tests/mason-core/installer/registry/installer_spec.lua
index 6ac25da94..51d9035e8 100644
--- a/tests/mason-core/installer/registry/installer_spec.lua
+++ b/tests/mason-core/installer/registry/installer_spec.lua
@@ -56,11 +56,32 @@ describe("registry installer :: parsing", function()
             version = "v1.2.3",
         }, parsed.purl)
         assert.same({
+            id = "pkg:dummy/package-name@v1.2.3",
             package = "package-name",
             extra_info = "here",
         }, parsed.source)
     end)
 
+    it("should keep unmapped fields", function()
+        installer.register_provider("dummy", dummy_provider)
+
+        local result = installer.parse({
+            schema = "registry+v1",
+            source = {
+                id = "pkg:dummy/package-name@v1.2.3",
+                bin = "node:server.js",
+            },
+        }, {})
+        local parsed = result:get_or_nil()
+
+        assert.is_true(result:is_success())
+        assert.same({
+            id = "pkg:dummy/package-name@v1.2.3",
+            package = "package-name",
+            bin = "node:server.js",
+        }, parsed.source)
+    end)
+
     it("should reject incompatible schema versions", function()
         installer.register_provider("dummy", dummy_provider)
 
@@ -277,6 +298,7 @@ describe("registry installer :: compiling", function()
                 name = "package-name",
                 version = "v1.2.3",
             }, {
+                id = "pkg:dummy/package-name@v1.2.3",
                 package = "package-name",
             })
         end
diff --git a/tests/mason-core/installer/registry/providers/github/release_spec.lua b/tests/mason-core/installer/registry/providers/github/release_spec.lua
index 47ac47c88..909eb36f3 100644
--- a/tests/mason-core/installer/registry/providers/github/release_spec.lua
+++ b/tests/mason-core/installer/registry/providers/github/release_spec.lua
@@ -225,6 +225,7 @@ describe("github provider :: release :: parsing", function()
 
         assert.is_true(result:is_success())
         assert.same({
+            id = "pkg:github/owner/repo@1.2.3",
             asset = {
                 target = "darwin_x64",
                 file = "old-asset.tar.gz",
@@ -235,6 +236,17 @@ describe("github provider :: release :: parsing", function()
                     out_file = "old-asset.tar.gz",
                 },
             },
+            version_overrides = {
+                {
+                    constraint = "semver:<=1.0.0",
+                    asset = {
+                        {
+                            target = "darwin_x64",
+                            file = "old-asset.tar.gz",
+                        },
+                    },
+                },
+            },
             repo = "owner/repo",
         }, parsed.source)
     end)