Move the Sigil.app*.txz from Downloads to your Desktop:
Then use Terminal.app to check out the file attributes as follows:
cd Desktop
ls -a@l *.txz
It will show you any extended attributes.
You are using Apple's tar program to both uncompress and unpack. I use a compiled opensource program from xz utils to run unxz on the .txz to get a .tar file. In this case the extended file attributes seem to get lost.
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