Quick fix

contracts/access/AMultiOwnable.sol

@@ -43,6 +43,15 @@ abstract contract AMultiOwnable is IMultiOwnable, Initializable {
         _addOwners(msg.sender.asSingletonArray());
     }
 
+    /**
+     * @dev Initializes the contract setting the array of initial owners.
+     */
+    function __AMultiOwnable_init(address[] memory initialOwners_) internal onlyInitializing {
+        if (initialOwners_.length == 0) revert InvalidOwner();
+
+        _addOwners(initialOwners_);
+    }
+
     /**
      * @notice The function to add equally rightful owners to the contract
      * @param newOwners_ the owners to be added

contracts/mock/access/MultiOwnableMock.sol

@@ -2,14 +2,26 @@
 // solhint-disable
 pragma solidity ^0.8.21;
 
-import {AMultiOwnable} from "./../../access/AMultiOwnable.sol";
+import {AMultiOwnable} from "../../access/AMultiOwnable.sol";
+
+import {TypeCaster} from "../../libs/utils/TypeCaster.sol";
 
 contract MultiOwnableMock is AMultiOwnable {
+    using TypeCaster for address;
+
     function __MultiOwnableMock_init() external initializer {
         __AMultiOwnable_init();
     }
 
+    function __MultiOwnableMockMulti_init(address[] memory initialOwners_) external initializer {
+        __AMultiOwnable_init(initialOwners_);
+    }
+
     function mockInit() external {
         __AMultiOwnable_init();
     }
+
+    function mockMultiInit() external {
+        __AMultiOwnable_init(msg.sender.asSingletonArray());
+    }
 }

contracts/mock/oracles/uniswap-v2/UniswapV2OracleMock.sol

@@ -13,11 +13,11 @@ contract UniswapV2OracleMock is AUniswapV2Oracle {
         address uniswapV2Factory_,
         uint256 timeWindow_
     ) external initializer {
-        __OracleV2_init(uniswapV2Factory_, timeWindow_);
+        __AUniswapV2Oracle_init(uniswapV2Factory_, timeWindow_);
     }
 
     function mockInit(address uniswapV2Factory_, uint256 timeWindow_) external {
-        __OracleV2_init(uniswapV2Factory_, timeWindow_);
+        __AUniswapV2Oracle_init(uniswapV2Factory_, timeWindow_);
     }
 
     function addPaths(address[][] calldata paths_) external {

contracts/oracles/AUniswapV2Oracle.sol

@@ -54,7 +54,7 @@ abstract contract AUniswapV2Oracle is Initializable {
      * @param uniswapV2Factory_ the Uniswap V2 factory
      * @param timeWindow_ the time between oracle observations
      */
-    function __OracleV2_init(
+    function __AUniswapV2Oracle_init(
         address uniswapV2Factory_,
         uint256 timeWindow_
     ) internal onlyInitializing {

test/access/MultiOwnable.test.ts

@@ -30,11 +30,30 @@ describe("MultiOwnable", () => {
   afterEach(reverter.revert);
 
   describe("access", () => {
+    it("should initialize", async () => {
+      const multiOwnableMock = await ethers.deployContract("MultiOwnableMock");
+
+      await expect(multiOwnableMock.__MultiOwnableMockMulti_init([]))
+        .to.be.revertedWithCustomError(multiOwnable, "InvalidOwner")
+        .withArgs();
+
+      await multiOwnableMock.__MultiOwnableMockMulti_init([FIRST.address]);
+
+      expect(await multiOwnableMock.isOwner(FIRST.address)).to.be.true;
+    });
+
     it("should not initialize twice", async () => {
       await expect(multiOwnable.mockInit()).to.be.revertedWithCustomError(multiOwnable, "NotInitializing").withArgs();
+      await expect(multiOwnable.mockMultiInit())
+        .to.be.revertedWithCustomError(multiOwnable, "NotInitializing")
+        .withArgs();
+
       await expect(multiOwnable.__MultiOwnableMock_init())
         .to.be.revertedWithCustomError(multiOwnable, "InvalidInitialization")
         .withArgs();
+      await expect(multiOwnable.__MultiOwnableMockMulti_init([FIRST.address]))
+        .to.be.revertedWithCustomError(multiOwnable, "InvalidInitialization")
+        .withArgs();
     });
 
     it("only owner should call these functions", async () => {