Scenario:
Map a large wood and map the inner areas. One inside area is large and comprises different parts of farmland, orchard meadow using the. The outline is mapped then cut up to use outline members as member parts of the farming lands. AFTER, select the inner outline member and the woodland outline to update the multipolygon relation with Crt+Shft+B. Does not work. Only after removing the large inner outline members from the farming relations could the could the large inner outline be made part of the woodland MP as inner.
Example of wood area: https://www.openstreetmap.org/relation/14608182
Inside multipolygon farmland relation that could not be made inner afterwards: https://www.openstreetmap.org/relation/14608176
It’s well conceivable the a large enveloping woodland is mapped around an already existing farming area to the point where mapping an enveloping outline of it all is truly uninviting highly laborious. The question being how this is achievable without having to resort to having to remove all the inside MP relations.