Remap words ABCUVW in argspec do not work unless the respective axis is enabled in the planner

[ZincBoy]

Here are the steps I follow to reproduce the issue:

1. Create a remap gcode (eg G65) with argspec=abcuvw in a config with only XYZ enabled.
2. call remapped gcode from MDI or other "G65 U1"

This is what I expected to happen:

The U parameter should be passed to the G65 remap code

This is what happened instead:

Error message "Bad character 'U' used" thrown. If axis U is enabled in the INI, the code works as expected.

It worked properly before this:

Tested on 2.8.2 and 2.7.14. Behavior is the same. I don't know if it worked in earlier versions.

Information about my hardware and software:

• I am using this Linux distribution and version (often, shown by lsb_release -a): Debian GNU/Linux 10 (buster)
• I am using this kernel version (shown by uname -a): 4.19.0-21-rt-amd64
• I am running ...
  • [ X] A binary version from linuxcnc.org (including buildbot.linuxcnc.org)
  • A binary I built myself
  • A binary version from some other source besides linuxcnc.org
• I am using this LinuxCNC version (shown in package manager or, for git versions, scripts/get-version-from-git): 2.8.2
• I am using this user interface (GUI) (e.g., AXIS, Touchy, gmoccapy, etc): gmoccapy, axis
• I am using this interface hardware vendor and chipset (e.g., parallel port, ethernet port, FPGA card): n/a