fix: Fix get1559CompatibilityWithNetworkClientId

packages/network-controller/CHANGELOG.md

@@ -17,6 +17,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Bump `@metamask/eth-json-rpc-middleware` from `^22.0.0` to `^22.0.1` ([#7330](https://github.com/MetaMask/core/pull/7330))
 
+### Fixed
+
+- Ensure `get1559CompatibilityWithNetworkClientId` updates network metadata with EIP-1559 compatibility data missing ([#7532](https://github.com/MetaMask/core/pull/7532))
+
 ## [27.0.0]
 
 ### Added

packages/network-controller/src/NetworkController.ts

@@ -2132,7 +2132,7 @@ export class NetworkController extends BaseController<
     networkClientId: NetworkClientId,
   ): Promise<boolean> {
     let metadata = this.state.networksMetadata[networkClientId];
-    if (metadata === undefined) {
+    if (metadata?.EIPS[1559] === undefined) {
       await this.lookupNetwork(networkClientId);
       metadata = this.state.networksMetadata[networkClientId];
     }

packages/network-controller/tests/NetworkController.test.ts

@@ -3590,7 +3590,7 @@ describe('NetworkController', () => {
           },
         );
       });
-      it('calls provider of the networkClientId and returns true', async () => {
+      it('updates network metadata if undefined', async () => {
         await withController(
           {
             infuraProjectId: 'some-infura-project-id',
@@ -3624,6 +3624,48 @@ describe('NetworkController', () => {
           },
         );
       });
+      it('updates network metadata if EIP-1559 compatibility is missing', async () => {
+        await withController(
+          {
+            infuraProjectId: 'some-infura-project-id',
+            state: {
+              networksMetadata: {
+                'linea-mainnet': {
+                  EIPS: {},
+                  status: NetworkStatus.Unknown,
+                },
+              },
+            },
+          },
+          async ({ controller }) => {
+            await setFakeProvider(controller, {
+              stubs: [
+                {
+                  request: {
+                    method: 'eth_getBlockByNumber',
+                    params: ['latest', false],
+                  },
+                  response: {
+                    result: POST_1559_BLOCK,
+                  },
+                },
+                {
+                  request: {
+                    method: 'eth_getBlockByNumber',
+                    params: ['latest', false],
+                  },
+                  response: {
+                    result: POST_1559_BLOCK,
+                  },
+                },
+              ],
+            });
+            const isEIP1559Compatible =
+              await controller.getEIP1559Compatibility('linea-mainnet');
+            expect(isEIP1559Compatible).toBe(true);
+          },
+        );
+      });
     });
 
     describe('if a provider has been set but networksMetadata[selectedNetworkClientId].EIPS in state already has a "1559" property', () => {