The javafxsdk.tbom file has a duplicate entry that should be removed:
$ grep -n rt/modules/jdk.packager/src/main/resources/com/oracle/tools/packager/mac/MacAppStoreBundler doc-files/javafxsdk.tbom
68: <file source="rt/modules/jdk.packager/src/main/resources/com/oracle/tools/packager/mac/MacAppStoreBundler%j.properties"
138: <file source="rt/modules/jdk.packager/src/main/resources/com/oracle/tools/packager/mac/MacAppStoreBundler%j.properties"
$ grep -n rt/modules/jdk.packager/src/main/resources/com/oracle/tools/packager/mac/MacAppStoreBundler doc-files/javafxsdk.tbom
68: <file source="rt/modules/jdk.packager/src/main/resources/com/oracle/tools/packager/mac/MacAppStoreBundler%j.properties"
138: <file source="rt/modules/jdk.packager/src/main/resources/com/oracle/tools/packager/mac/MacAppStoreBundler%j.properties"