Spindle FWD button issue

Hello,
I have come across this strange behaviour:



Run spindle, lower rpm via S code and spindle stops. However button FWD stays on
So two issues:
1) spindle stops via S6000 command in this case
2) FWD button does not reflect current spindle state

UPDATE: It is happing on sim and axis as well, so probably general LinuxCNC issue.

I will double check the minimal rpm speeds for spindle, but I am able to start the spindle even at 300rpm.
The issue is, that when the spindle is started using FWD button and then changed speed only via S command in MDI, the spindle does not change the speed, but stops entirely, but the hal pin stays in mixed state:spindle.0.runs-forward is true but spindle.0.is-on is false.