I thought so at first also and have run it awhile. The detent started to locke up a couple time and was able to get it free. I think the valve body must have some rusty erosion around the detent lockout.
Not real sure, I put new seals in and new detent balls... after that worked ok for a while then the lift spool started "hanging" to the point I had to stomp the pedal to get into float mode, now ok occasionally.
Lift arms will drift down in less than a minute.... If main high pressure relief valve was leaking wouldnt bucket tilt also drift? Additional symptom is when I park it with lift arms down it will lift front wheels several inches off the ground.