I found a bug in several objects after applying mask/clip-path giving me clue for lot of bug I found in inkscape.
the object created (linked offset, or in some case a text to path,...) didn't follow the original object position. But keep the position of the object at the moment of setting of the mask/clip-path
That's because when a mask/clip-path is set on an object, when the object move, the object coordinates are not longer modified, but a translation matrix is applied.
At least the linked offset, doesn't duplicate transformation matrix (transformation attribute), then keep the original position/rotation.
This cause the offset to go to buggy place when the original object is rotated + moved even without mask/clip-path.
I will try to resolve this bug quickly but some help would be welcome.