Queue is not empty after probing

Version 2.9.7.
When cyclically calling the command queue

G38.3 Z1
G38.5 Z30
G38.3 Y[#<_y> + 1]
G38.3 Z1

I constantly get an error "Queue is not empty after probing"
The topic is discussed on the forum - https://forum.linuxcnc.org/38-general-linuxcnc-questions/51443-how-to-fix-queue-is-not-empty-after-probing?start=10#338958



