The attributes _restrictions_graph and _extensions_graph, introduced in #25417 were not affected by the method _del_derived, whereas _restrictions was, causing some issues.

CC: @egourgoulhon

Component: geometry

Keywords: restriction, extension, tensorfield

Author: Florentin Jaffredo

Branch/Commit: 043f084

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/26012