[SalesForce] Testing LWC with multiple @wire getRecord calls with Jest

I thought this would be straight-forward, but it turns out to be a complete nightmare. Found no help on google, in the lwc-recipes or documentation.

Here's my issue: I have a LWC that makes multiple asynchronous server calls, two of them use the same getRecord method from lightning/uiRecordApi.

    @wire(getRecord, {recordId : '$opportunityId', fields: [
        OPPORTUNITY_STAGE_FIELD,
        OPPORTUNITY_SYNCED_QUOTE_STATUS_FIELD,
        OPPORTUNITY_CONTACT_ID,
        OPPORTUNITY_SYNCED_QUOTE_LINE_ITEM_COUNT,
        OPPORTUNITY_ACCOUNT_SHIPPING_ADDRESS_COMPLETE,
        OPPORTUNITY_ACCOUNT_BILLING_ADDRESS_COMPLETE
    ]})
    getOpportunity(result) {
        this.opportunity = result;
        this.contactId = getFieldValue(this.opportunity.data, OPPORTUNITY_CONTACT_ID);
    }

    @wire(getRecord, { recordId : '$contactId', fields: [CONTACT_EMAIL_FIELD]})
    contact;

    @wire(checkPermission)
    permission;

My code works: The data provisioned from getRecord is first written to the opportunity and then to the contact variable.

However, it turns out to be untestable. If I write it like this, the contact-data is written to both the opportunity and the contact variable. If I only emit OPPORTUNITY_VALID, both variables have the opportunity data.

test('valid opportunity and valid contact => submit button enabled', async () => {

    const element = createElement('c-create-order-from-opportunity', {
        is: createOrder 
    });

    element.opportunityId = OPPORTUNITY_VALID.id;
    getRecordWireAdapter.emit(OPPORTUNITY_VALID);
    getRecordWireAdapter.emit(CONTACT_VALID);    
    checkPermissionWireAdapter.emit(true);

    document.body.appendChild(element);

    await Promise.resolve();

    let submitButton = element.shadowRoot.querySelector('[data-id="submitButton"]');
    expect(submitButton.disabled).toBe(false);

    let msgBoxes = element.shadowRoot.querySelectorAll('c-message-box');
    expect(msgBoxes.length).toBe(0);

});

I also tried to use Promise.resolve() between .emit() calls, but this did not work either.

Can anybody help me writing solid unit tests for a component that uses multiple independent @wired properties/functions with getRecord calls? My last resort would be to stop using getRecord in both instances and write my own apex method for getting the contact data so I can then mock the apex method.