-nodetypes attribute is added to pathes in svg

Steps to reproduce:

• open Inkscape
• draw straight line with free hand tool
• deselect line
• select line
• doubleclick line to create new node
• save as svg

What happened?

in XML of svg: an attribute '-nodetypes' inside path element is created

What should have happened?

Not sure, but inkscape 92.2 creates a "sodipodi:nodetypes" attribute

Inkscape Version and Operating System:

• Inkscape Version: 1.0alpha (4855a8a2, 2019-03-08)
• Operating System: Win 7 x64

Thanks. Great to see the 1.0 alpha, looks very good! Best feature: origin in upper left corner, finally!