LE Settings app tar backup file problem

LE ver Matrix nightly 20210129

Hardware: NUC7i5BNK (i5-7260U, Intel Iris Plus Graphics 640, 16 GB ram, 256 GB M.2 SSD)

Issue: With previous versions of LE (Leia and earlier) I could open the tar file produced by the LibreELEC Settings app backup function (with 7-Zip), add, remove or edit files and folders, close the archive and restore it to LE with the new changes. The tar archive looked like the image on the left when opened in Windows with 7-Zip. The one on the right is what is now produced by the Matrix nightlys.

Now, the backup tar has an additional folder labeled "." full of PaxHeader files. When I open the "storage" folder I see the expected contents, but if I try to add a file or folder (advancedsettings.xml or sorces.xml for example), 7-Zip crashes. I *can* open and edit an existing file successfully.

Any ideas? Thanks in advance! Yes,

Thank you, mglae. I will look for a zip/tar utility that is compliant with the new tar format.