i'm sorry, i confirm 7zip only extracts 3 folders instead of 5. I just didn't pay enough attention, and verification of latest version reports an error.
Total Commander instead has no problem in handling it.
I've found that it happens with file paths longer than 100.
It took me hours, but now it should be able to produce TAR files that are good for 7zip as well.
You will get it in the next version, 2.3h, soon to be released