If is posibol in SVG link text path to a clone we can fix it but I think it not posibol in current spec.
Another way to fix it is not use original path as deformer, put it on DEFS and retain a clone instead the path. To edit with path manipulator can show a path with node tool when text on a path selected. The problem with this is the clone don't be linked to the text and don't move the text when move the "Path/Clone" like currently.
To fix this bug we can:
If is posibol in SVG link text path to a clone we can fix it but I think it not posibol in current spec.
Another way to fix it is not use original path as deformer, put it on DEFS and retain a clone instead the path. To edit with path manipulator can show a path with node tool when text on a path selected. The problem with this is the clone don't be linked to the text and don't move the text when move the "Path/Clone" like currently.