Dynamic components do not work with scoped slots

[nolanlawson]

With scoped slots, this works:

<x-counter>
    <template lwc:slot-data="data">
        <span>{data.id} - {data.name}</span>
    </template>
</x-counter>

However, if that same <x-counter> component is used with <lwc:component> (aka dynamic components):

<lwc:component lwc:is={customCtor}>
    <template lwc:slot-data="data">
        <span>{data.id} - {data.name}</span>
    </template>
</lwc:component>

... then you get an error at compile time:

Error: LWC1178: <template> tag with lwc:slot-data directive must be the direct child of a custom element.

Repro

[nolanlawson]

See #4920 which contains fixture tests that should be updated once this bug is fixed.

[nolanlawson]

Reopening since #4976 was a partial fix. It fixed this for @lwc/ssr-* but not engine-dom or engine-server.