Schemas with the same table name can not be synced with constraints

src/sscce-sequelize-6.ts

@@ -1,10 +1,10 @@
-import { DataTypes, Model } from 'sequelize';
+import { DataTypes } from 'sequelize';
 import { createSequelize6Instance } from '../setup/create-sequelize-instance';
 import { expect } from 'chai';
 import sinon from 'sinon';
 
 // if your issue is dialect specific, remove the dialects you don't need to test on.
-export const testingOnDialects = new Set(['mssql', 'sqlite', 'mysql', 'mariadb', 'postgres', 'postgres-native']);
+export const testingOnDialects = new Set(['postgres']);
 
 // You can delete this file if you don't want your SSCCE to be tested against Sequelize 6
 
@@ -19,23 +19,72 @@ export async function run() {
       // For less clutter in the SSCCE
       timestamps: false,
     },
-  });
+  })
 
-  class Foo extends Model {}
+  // Create schemas
+  await sequelize.createSchema('schema_a', {})
+  await sequelize.createSchema('schema_b', {})
 
-  Foo.init({
-    name: DataTypes.TEXT,
-  }, {
-    sequelize,
-    modelName: 'Foo',
-  });
+  // Table `users` within schema `schema_a`
+  const User1 = sequelize.define(
+    'User',
+    {
+      id: {
+        type: DataTypes.BIGINT,
+        allowNull: false,
+        primaryKey: true,
+        autoIncrement: true,
+      },
+    },
+    {
+      tableName: 'users',
+      schema: 'schema_a'
+    }
+  )
+
+  // Create `files` within schema `schema_a` that belongs to `user`
+  const File = sequelize.define(
+    'File',
+    {
+      id: {
+        type: DataTypes.BIGINT,
+        allowNull: false,
+        primaryKey: true,
+        autoIncrement: true,
+      },
+    },
+    {
+      tableName: 'files',
+      schema: 'schema_a'
+    }
+  )
+
+  File.belongsTo(User1, {
+    as: 'file',
+    foreignKey: 'fileId',
+    constraints: true, // Set this to false and use the `User2` model and it will work just right.
+  })
+
+  // Table `user` within schema `schema_b`
+  const User2 = sequelize.define( // Comment this model and use constraints with `belongsTo` and it will work just right.
+    'User',
+    {
+      id: {
+        type: DataTypes.BIGINT,
+        allowNull: false,
+        primaryKey: true,
+        autoIncrement: true,
+      },
+    },
+    {
+      tableName: 'users',
+      schema: 'schema_b'
+    }
+  )
 
   // You can use sinon and chai assertions directly in your SSCCE.
   const spy = sinon.spy();
   sequelize.afterBulkSync(() => spy());
   await sequelize.sync({ force: true });
   expect(spy).to.have.been.called;
-
-  console.log(await Foo.create({ name: 'TS foo' }));
-  expect(await Foo.count()).to.equal(1);
 }