This is with the latest stable, but I have seen this issue with the float volumes before I don’t think it is new. The gist it cannot capture the true max and it leaves some of the voxels unselected.
Unselected region values are around 33.317… and should be included in the selection (since the max is set to 33.32). I cannot manually change the value either. So I think the internal selection logic is not using the same level of precision as the widget displaying selected threshold range
