I tried looking into it, but couldn't find anything about why this might be happening. You're probably best off asking for help on the forums or in the irc.
EDIT: Here's what worked for me in a previous version of the script
pkgname=pureref
pkgver=1.9.2
pkgrel=1
pkgdesc="PureRef was created to be a simple and lightweight tool for artists to organize and view their reference images."
arch=('x86_64')
url="https://www.pureref.com"
license=('unknown')
options=('emptydirs')
key=$(curl https://www.pureref.com/download.php | sed -n -e 's/^.*var key = "\(.*\)".*/\1/p')
source=("$pkgname-$pkgver.rpm::https://www.pureref.com/files/installer.php?build=UNIX64.rpm&downloadKey=$key")
md5sums=('55916c771c68e771b9cf73e6e292a512')
package() {
bsdtar -C ${pkgdir} -xf ${srcdir}/${pkgname}-${pkgver}.rpm
}
EDIT 2: I can't tell what part of the process it's failing at. Using bsdtar instead didn't help at all. I didn't try getting the rpm instead of the deb though.
EDIT 3: I basically remade the above script with some changes based on yours and even with it using the rpm and only the one command it's having the exact same issue. I'm out of ideas, sorry.
EDIT 4: All that and some help from the forums helped me narrow it down. Trying adding option=('!strip'). This will keep needed information from being stripped from the AppImage. People also say binaries should go in opt/ but I don't know anything about that.
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