changing barline at the end of a section change measure numbering and UNDO doesn't totally undo

Given the attached score, where three sections are visible each one starting at measure #1, changing the barline of second section into a final barline makes the measure numbering to change into the continuation of first section.
Clicking on UNDO, while it changes the barline, it doesn't change to original numbering.
[MuS : 3.6.2.548021803 - Rev. 3224f34]