Aura cannot handle signed packages

[Carlson24]

I have been trying to sign all the packages on my system, and I have set up makepkg to sign the built packages by default. However, this has caused issues with Aura, which is unable to extract the signature files, thereby preventing the installation of the built packages.
The specific manifestation is:
I customized the makepkg package output directory to /mnt/aur/pkg, and the signature files are also there. After Aura builds the packages, it only moves *.pkg.tar.zst without synchronizing the movement of *.pkg.tar.zst.sig. Subsequently, calling pacman -U fails.

[Carlson24]

This might be the same as #211.