Some test QGIS builds now ship with Qt6 instead of Qt5, specifically the one referenced here: https://github.com/qgis/QGIS/issues/46299#issuecomment-2577353353 MultipartSplit is not compabible with Qt6 and thus disabled in the Plugin Manager: <img width="371" alt="Screenshot 2025-01-11 at 20 28 25" src="https://github.com/user-attachments/assets/2a8aeea4-bd5c-4620-9acc-123ec4b6214b" />
Some test QGIS builds now ship with Qt6 instead of Qt5, specifically the one referenced here: qgis/QGIS#46299 (comment)
MultipartSplit is not compabible with Qt6 and thus disabled in the Plugin Manager: