SNAPCRAFT_PART_SRC is empty in override-pull plugin v2

When using snapcraft 4 + core20 SNAPCRAFT_PART_SRC is empty.

Maybe it’s a feature, but I didn’t see it in changelog.

Without seeing your yaml I think we’ll be stabbing in the dark. Also you made a statement but didn’t ask a question, so it’s not clear whether you want help with this or merely making a passing comment…