diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9a9237fa9..138f054ff0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,14 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+### Added
+
  - #2887, Add Preference `max-affected` to limit affected resources - @taimoorzaeem
 
+### Fixed
+
+  - #3124, Fix table's media type handlers not working for all schemas - @steve-chavez
+
 ## [12.0.1] - 2023-12-12
 
 ### Fixed
diff --git a/src/PostgREST/SchemaCache.hs b/src/PostgREST/SchemaCache.hs
index 12b9a136e8..65d0416d37 100644
--- a/src/PostgREST/SchemaCache.hs
+++ b/src/PostgREST/SchemaCache.hs
@@ -1167,7 +1167,7 @@ mediaHandlers pgVer =
         join pg_type      arg_name     on arg_name.oid = proc.proargtypes[0]
         join pg_namespace arg_schema   on arg_schema.oid = arg_name.typnamespace
       where
-        proc_schema.nspname = ANY('{test}') and
+        proc_schema.nspname = ANY($1) and
         proc.pronargs = 1 and
         arg_name.oid in (select reltype from all_relations)
       union
@@ -1182,7 +1182,8 @@ mediaHandlers pgVer =
         join pg_namespace pro_sch on pro_sch.oid = proc.pronamespace
         join media_types mtype on proc.prorettype = mtype.oid
         join pg_namespace typ_sch     on typ_sch.oid = mtype.typnamespace
-      where NOT proretset
+      where
+        pro_sch.nspname = ANY($1) and NOT proretset
       |] <> (if pgVer >= pgVersion110 then " AND prokind = 'f'" else " AND NOT (proisagg OR proiswindow)")
 
 decodeMediaHandlers :: HD.Result MediaHandlerMap
diff --git a/test/memory/memory-tests.sh b/test/memory/memory-tests.sh
index 9d91518e43..20967082d9 100755
--- a/test/memory/memory-tests.sh
+++ b/test/memory/memory-tests.sh
@@ -102,7 +102,7 @@ postJsonArrayTest(){
 
 echo "Running memory usage tests.."
 
-jsonKeyTest "1M" "POST" "/rpc/leak?columns=blob" "26M"
+jsonKeyTest "1M" "POST" "/rpc/leak?columns=blob" "27M"
 jsonKeyTest "1M" "POST" "/leak?columns=blob" "16M"
 jsonKeyTest "1M" "PATCH" "/leak?id=eq.1&columns=blob" "16M"
 
diff --git a/test/spec/Feature/Query/MultipleSchemaSpec.hs b/test/spec/Feature/Query/MultipleSchemaSpec.hs
index deaa595457..7b25e2ffaf 100644
--- a/test/spec/Feature/Query/MultipleSchemaSpec.hs
+++ b/test/spec/Feature/Query/MultipleSchemaSpec.hs
@@ -150,6 +150,20 @@ spec =
             matchStatus = 406
           }
 
+      it "succeeds in calling handler with a domain on another schema" $
+        request methodGet "/another_table" [("Accept-Profile", "v2"), (hAccept, "text/plain")] ""
+          `shouldRespondWith` "plain"
+          { matchStatus = 200
+          , matchHeaders = ["Content-Type" <:> "text/plain; charset=utf-8", "Content-Profile" <:> "v2"]
+          }
+
+      it "succeeds in calling handler with a domain on an exposed schema" $
+        request methodGet "/another_table" [("Accept-Profile", "v2"), (hAccept, "text/special")] ""
+          `shouldRespondWith` "special"
+          { matchStatus = 200
+          , matchHeaders = ["Content-Type" <:> "text/special", "Content-Profile" <:> "v2"]
+          }
+
     context "calling procs on different schemas" $ do
       it "succeeds in calling the default schema proc" $
         request methodGet "/rpc/get_parents_below?id=6" [] ""
@@ -194,6 +208,20 @@ spec =
           , matchHeaders = [matchContentTypeJson, "Content-Profile" <:> "v2"]
           }
 
+      it "succeeds in calling handler with a domain on another schema" $
+        request methodGet "/rpc/get_plain_text" [("Accept-Profile", "v2"), (hAccept, "text/plain")] ""
+          `shouldRespondWith` "plain"
+          { matchStatus = 200
+          , matchHeaders = ["Content-Type" <:> "text/plain; charset=utf-8", "Content-Profile" <:> "v2"]
+          }
+
+      it "succeeds in calling handler with a domain on an exposed schema" $
+        request methodGet "/rpc/get_special_text" [("Accept-Profile", "v2"), (hAccept, "text/special")] ""
+          `shouldRespondWith` "special"
+          { matchStatus = 200
+          , matchHeaders = ["Content-Type" <:> "text/special", "Content-Profile" <:> "v2"]
+          }
+
     context "Modifying tables on different schemas" $ do
       it "succeeds in patching on the v1 schema and returning its parent" $
         request methodPatch "/children?select=name,parent(name)&id=eq.1" [("Content-Profile", "v1"), ("Prefer", "return=representation")]
diff --git a/test/spec/fixtures/schema.sql b/test/spec/fixtures/schema.sql
index 539e8e2a02..8d268dcc5a 100644
--- a/test/spec/fixtures/schema.sql
+++ b/test/spec/fixtures/schema.sql
@@ -2169,6 +2169,42 @@ returns setof v2.parents as $$
   select * from v2.parents where id < $1;
 $$ language sql;
 
+create function v2.get_plain_text()
+returns test."text/plain" as $$
+  select 'plain'::test."text/plain";
+$$ language sql;
+
+create domain v2."text/special" as text;
+
+create function v2.get_special_text()
+returns v2."text/special" as $$
+  select 'special'::v2."text/special";
+$$ language sql;
+
+create or replace function v2.special_trans (state v2."text/special", next v2.another_table)
+returns v2."text/special" as $$
+  select 'special'::v2."text/special";
+$$ language sql;
+
+drop aggregate if exists v2.special_agg(v2.another_table);
+create aggregate v2.special_agg (v2.another_table) (
+  initcond = ''
+, stype = v2."text/special"
+, sfunc = v2.special_trans
+);
+
+create or replace function v2.plain_trans (state test."text/plain", next v2.another_table)
+returns test."text/plain" as $$
+  select 'plain'::test."text/plain";
+$$ language sql;
+
+drop aggregate if exists v2.plain_agg(v2.another_table);
+create aggregate v2.plain_agg (v2.another_table) (
+  initcond = ''
+, stype = test."text/plain"
+, sfunc = v2.plain_trans
+);
+
 create table private.screens (
   id serial primary key,
   name text not null default 'new screen'