Node Slider Bug at 0.1 step only on release?

Node slider send two values at 0.1 step only on release.

[{"id":"9edcb632.bf91d8","type":"ui_slider","z":"922b3bfe.c981c8","name":"","label":"slider","tooltip":"","group":"7c9bfa11.94ec94","order":1,"width":0,"height":0,"passthru":true,"outs":"end","topic":"","min":"42","max":"54","step":"0.1","x":1065,"y":315,"wires":[[]]},{"id":"7c9bfa11.94ec94","type":"ui_group","z":"","name":"Test slider","tab":"8528e289.97e2c","disp":true,"width":"12","collapse":false},{"id":"8528e289.97e2c","type":"ui_tab","z":"","name":"Slider","icon":"dashboard","disabled":false,"hidden":false}]

System Info:

node-red 0.20.8
node dashboard 2.19.3
node-js 10.15.2

Please see this post for how to share a flow so that it is importable. You can edit your first flow.
Also please explain a bit more what problem you are seeing.

When I slide only on release, two simultaneous msg.payload are sent.... only when step is 0.1

If I put step to 1, only one msg.payload is sent when I slide only on release.

That's all.

I am not seeing that, but for me, running in Waterfox browser on Ubuntu Output on Release doesn't work properly at all. When I release the mouse button it doesn't stop controlling the slider, even if I move the mouse away. I have to click it to get it to 'release'. Running dashboard 2.19.3, node-red 1.0.2

Did you noticed differences from step 0.1 to step 1 on release mouse ?

Since it doesn't send anything when I release the mouse then no. It is ignoring the release.