Any office becomes vacant upon the fact and without any declaration by tacit resignation
Sorry, you don't get to make this call. You don't get to privately interpret canon law. You are not the Church.
Secondly, the most important part of your sentence is "by tacit resignation", which again (for the 500th time) can only be decided by Church authorities....especially in the case where the V2 officials have. not. resigned. They are still in office, they want to be in office and they are working in their offices.
Do you know what "resign" means? It means when someone declares they are "stepping down" (explicit) or they just leave and disappear (implicit).
None of this applies to V2 officials and only your wild imagination/private interpretation thinks canon law applies here.