Raster Layer properties additional no data value, weird field behavior

When entering the additional no data value under Layer properties → Transparency → Additional no data value,

AND clicking Apply, the entered value is used (pixels are masked to nodata, works fine)

BUT the entered value is doubled in the field, i.e., “1000” becomes “10001000” and if you would click OK afterwards the Additional no data value will be changed to “10001000”