for example, we tried adding @click event listener on CButton, but click event didn't register:

<c-button
    @click="login"
    :disabled="isLoading"
    color="primary"
    type="submit"
    class="px-4"
>
    Login
</c-button>

If we add a wrapper div around it, and place the @click event listener there, it registers the click.

Can you try to remove this line :disabled="isLoading" and check.

If disabled is to true then the button doesn't emit the event.

hmm no, removing :disabled="isLoading" also didn't help.

I can make it work by adding .native to @click, like this:
<c-button @click.native="login">Login CB</c-button>

Maybe I forgot to import some part of CoreUI lib? I have these imports in main.js:

import '@coreui/coreui/dist/css/coreui.min.css';
import CoreUI from '@coreui/vue';
app.use(CoreUI);

BTW, still not getting any email response from support :)

Please change import CoreUI from '@coreui/vue'; => import CoreuiVue from '@coreui/vue', and app.use(CoreUI); => app.use(CoreuiVue);

hmm, changed this, but its still the same, only works with @click.native

@aviatmcel please update to version v4.2.0