Clear_on_hide does not work

Hi there,

the code clear_one_hide does not work.

On the receipt email, I receive both answers.

My code :

[group Forfaitindiv clear_on_hide]
[select_custom* indiv class:form-control placeholder clear_on_hide “” “1015|Mission Promotion Hôtel Portello – 1015 euros” “1206|Mission Convention Hôtel Garden Inn Milan North – 1206 euros” “1119|Mission Convention Hôtel Michelangelo – 1119 euros” “1269|Mission Convention Hôtel Double Tree by Hilton – 1269 euros” “1587|Mission Confort Hôtel Holiday Inn Garibaldi – 1587 euros” “1767|Mission Confort Plus Hôtel Hilton Milan – 1767 euros”]
[/group][group Forfaitdouble clear_on_hide]
[select_custom* double class:form-control placeholder clear_on_hide “” “795|Mission Promotion Hôtel Portello – 795 euros” “856|Mission Convention Hôtel Garden Inn Milan North – 856 euros” “859|Mission Convention Hôtel Michelangelo – 859 euros” “900|Mission Convention Hôtel Double Tree by Hilton – 900 euros” “1243|Mission Confort Hôtel Holiday Inn Garibaldi – 1243 euros” “1372|Mission Confort Plus Hôtel Hilton Milan – 1372 euros”]
[/group]

How can I do ?

thanks a lot for your help