issues with app package installation reporting failure and app mistakenly installed under "App Name.localized" parent directory

I'm having strange issues trying to install a package I've created when a different version of the application already exists in /Applications

The installer throws an error about the postinstall script failing, seemingly because the last thing that script tries to do is call "open /Applications/App Name.app" which appears to be failing because the application is mistakenly being installed to "/Applications/App Name.localized/App Name.app"

I can't figure out why this is happening during the installation and a follow-up attempt to install the same package succeeds because that time the application properly gets installed to "/Applications/App Name.app"

Here are some background & details:

• In previous releases of this app, there were some issues I believe were related to relocation so since then the I added a preinstall script to the installation package that first checks for the existence of "/Applications/App Name.app" & removes it should it be found
• Here is how the package is being built:

#!/bin/bash

IDENTITY_NAME_APPLICATION="Developer ID Application: COMPANY NAME LLC"
IDENTITY_NAME_INSTALLER="Developer ID Installer: COMPANY NAME LLC"

TMPDIR="./tmp"
RAWAPP="App Name.app"
APP_PLIST="./plist/com.corp.appname.plist"
PKGNAME="App_Name.pkg"

echo "Setup tmp directory: ${TMPDIR}"
rm -rf ${TMPDIR}
mkdir -p ${TMPDIR}/root/Applications
mkdir -p ${TMPDIR}/root/Library/LaunchDaemons
if [ ! -d "./Raw App/${RAWAPP}" ]; then
	echo "ERROR: could not find ./Raw App/${RAWAPP}"
	exit 1
fi
cp -r "./Raw App/${RAWAPP}" ${TMPDIR}/root/Applications
cp -r "${APP_PLIST}" ${TMPDIR}/root/Library/LaunchDaemons

echo "Codesigning the app bundle"
codesign \
    --options runtime \
    --timestamp --deep \
    -s "$IDENTITY_NAME_APPLICATION" \
    "${TMPDIR}/root/Applications/${RAWAPP}"

echo "Creating a codesigned installer"
pkgbuild \
    --sign "$IDENTITY_NAME_INSTALLER" \
    --root "${TMPDIR}/root" \
    --component-plist "./plist/appname_component.plist" \
    --scripts ./scripts \
    ${TMPDIR}/AppNameComponent.pkg
productbuild \
    --sign "$IDENTITY_NAME_INSTALLER" \
    --package ${TMPDIR}/AppNameComponent.pkg \
    ${TMPDIR}/${PKGNAME}

echo "Clean up"
rm -r ${TMPDIR}/root ${TMPDIR}/AppNameComponent.pkg

echo "Final codesigned pkg: ${TMPDIR}/${PKGNAME}"