I tried to import an AppleSingle file to a Prodos Disk Image on a Linux machine. If I use -a=$1234 parameter, the auxtype becomes $00EA (234) and there is no error/warning message.

If I use -a=$0000, I get this message:
Invalid value for option '--addr': cannot convert '-bash000' to Integer (java.lang.NumberFormatException: For input string: "-bash000")

It means that $0 has been interpreted as Bash Shell special parameter $0.

If I quote the address like -a='$1000', it works. There is no such problem on Windows machines.

If this problem can't be fixed, I think it is better to remove this feature because this problem is producing incorrect result without any error/warning message and not all users realize it is necessary to quote the address in dollar sign notation.