Custom section breaks after update 4.6->4.7

The CMS Questions
1

After updating Kirby core from 4.6 to 4.7, my custom sections plugin stopped working.
I received a “The section type “xxx” is not valid” error in the panel.

After some digging I found out the culprit.
I used to do this:

import testSection from "./components/test.vue";

panel.plugin("bvdputte/test", {
    sections: {
        test: {
            extends: testSection,
        }
    }
});

but apparently, I’m breaking Kirby with this. Changing this to

import testSection from "./components/test.vue";

panel.plugin("bvdputte/test", {
    sections: {
        test: testSection
    }
});

fixed it.

But I don’t really understand why I’m not allowed to do this any longer?
We’re not allowed to extend our components any longer?

2

Anything in the browser console?

3

I’m not at my work laptop, but I see this in the staging env:

Screenshot 2025-05-29 at 11.59.12
Screenshot 2025-05-29 at 11.59.121074×462 46.5 KB

(I’m back on Monday)

4

Thanks, I could reproduce it and created an issue: Plugin: error when component extends another component · Issue #7253 · getkirby/kirby · GitHub

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