QGIS » QGIS Application

Hi,

When starting r.contour from the GRASS group on a raster with "Increment between contour levels", "Maximum contour level" and "Minimum contour level" fields filled out, but "List of contour levels" left blank, I get the "Wrong Parameter Value" error on the latter field.
[screenshot joined]

However, the 7.4 GRASS documentation states :

Contours can be produced using a comma-separated list of values in levels, or at some regular increment using the step parameter, using minlevel and maxlevel as minimum and maximum contour values, respectively. If no minlevel or maxlevel is specified, the minimum and maximum cell values in the input raster map will be used.

and

r.contour will either step through incremental contours or produce contours from a list of levels, not both. If both a list of levels and a step are specified, the list will be produced and the step will be ignored.

I get from this that it should be allowed to enter Step only, without List nor MinMax, or Step and MinMax without List.

Python version : 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)]
Qgis version : 3.2.0-Bonn, bc43194061
GRASS version : GRASS 7 version 2.0 (as displayed in Plugins-> Installed), 7.4.1 (as seen in OSGeo4W setup)