When trying load in Editor sim crashes - seems like .xml data is broken

Good day!
I´m looking for some help with a scenery I created. I built the package initially some time ago and it works perfectly fine. Now I wanted to make some changes in the scenery. I open the project with the .xml file and it loads into the project editor without any flaws. Then I go into Inspector and whenever I try to “load in editor” the sim crashes. For me it seems there is a problem with the PackageSources/Scenery/.xml file. Is there any chance a new .xml package sources file can be created by the built package or do you have any ideas for the reason the file doesn´t work?

Best regards and thanks for the help!
Ole