Fix N-17

contracts/proxy/beacon/UpgradeableBeacon.sol

@@ -51,7 +51,6 @@ contract UpgradeableBeacon is IBeacon, Ownable {
      */
     function upgradeTo(address newImplementation) public virtual onlyOwner {
         _setImplementation(newImplementation);
-        emit Upgraded(newImplementation);
     }
 
     /**
@@ -66,5 +65,6 @@ contract UpgradeableBeacon is IBeacon, Ownable {
             revert BeaconInvalidImplementation(newImplementation);
         }
         _implementation = newImplementation;
+        emit Upgraded(newImplementation);
     }
 }

test/proxy/beacon/UpgradeableBeacon.test.js

@@ -20,6 +20,13 @@ contract('UpgradeableBeacon', function (accounts) {
       this.beacon = await UpgradeableBeacon.new(this.v1.address, owner);
     });
 
+    it('emits Upgraded event to the first implementation', async function () {
+      const beacon = await UpgradeableBeacon.new(this.v1.address, owner);
+      await expectEvent.inTransaction(beacon.contract.transactionHash, beacon, 'Upgraded', {
+        implementation: this.v1.address,
+      });
+    });
+
     it('returns implementation', async function () {
       expect(await this.beacon.implementation()).to.equal(this.v1.address);
     });