You did not reboot your system after update ? … I build it on two installs, and i’m sharing just the last part of the build/install
install -d -m 755 /var/tmp/pamac-build-b/foo2zjs-nightly/pkg/foo2zjs-nightly/usr/bin
install -c -m 755 foo2zjs-loadfw /var/tmp/pamac-build-b/foo2zjs-nightly/pkg/foo2zjs-nightly/usr/bin
install -d -m 755 /var/tmp/pamac-build-b/foo2zjs-nightly/pkg/foo2zjs-nightly/usr/lib/udev/rules.d
install -c -m 644 hplj10xx.rules /var/tmp/pamac-build-b/foo2zjs-nightly/pkg/foo2zjs-nightly/usr/lib/udev/rules.d/71-hplj10xx.rules
install -d -m 755 /var/tmp/pamac-build-b/foo2zjs-nightly/pkg/foo2zjs-nightly/usr/lib/systemd/system
install -c -m 644 foo2zjs-loadfw@.service /var/tmp/pamac-build-b/foo2zjs-nightly/pkg/foo2zjs-nightly/usr/lib/systemd/system
==> Tidying install...
-> Removing empty directories...
-> Removing libtool files...
-> Purging unwanted files...
-> Removing static library files...
-> Stripping unneeded symbols from binaries and libraries...
-> Compressing man and info pages...
==> Checking for packaging issues...
==> Creating package "foo2zjs-nightly"...
-> Generating .PKGINFO file...
-> Generating .BUILDINFO file...
-> Adding install file...
-> Generating .MTREE file...
-> Compressing package...
==> Leaving fakeroot environment.
==> Finished making: foo2zjs-nightly 20201127-1 (Du 28 nov 2021 12:16:27 +0200)
==> Cleaning up...
Checking keyring... [1/1]
Checking integrity... [1/1]
Loading packages files... [1/1]
Checking file conflicts... [1/1]
Checking available disk space... [1/1]
Installing foo2zjs-nightly (20201127-1)... [1/1]
> Now reloading udev rules database...
> Now restarting CUPS...
> You need to add your user to the lp group.
> Please refer to the table at http://foo2zjs.rkkda.com
> to choose the appropriate driver for your printer.
Running post-transaction hooks...
Reloading system manager configuration... [1/4]
Reloading device manager configuration... [2/4]
Arming ConditionNeedsUpdate... [3/4]
Refreshing PackageKit... [4/4]
Transaction successfully finished.
By the way, if you somehow added sudo before pamac command … don’t do that.