The function generate_dataset_item() does not generate correclty the dataset_item() in the loguniform option as it use the decimal paramter as a numbre of significant figure. So is decimal is set to 0 the result is 0...
A bug unnoticed since the CREATION of this question type.
This is why I set to 1.6. but could be 1.5.
As it was unnoticed I will not merge to 1.5.