Seems we have somehow lost the fix to this issue in 2.9: https://github.com/LinuxCNC/linuxcnc/issues/2460 which was supposedly fixed by: https://github.com/LinuxCNC/linuxcnc/commit/7852337dfdc6cda49db31a3b13ca333d4e6d874f but line #982 is still in current 2.9: https://github.com/LinuxCNC/linuxcnc/blob/2.9/src/emc/usr_intf/axis/scripts/axis.py#L982 it is fixed in master: https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/usr_intf/axis/scripts/axis.py#L982