After update placeholder-texts disappeared in filters

After updating to 4.16.1 our search for educations lost all placeholder texts, filter fileds only say “Select some options…”.

We have tried to save settings again in Ajax Search Pro -> etusivun haku -> Frontend search settings -> Categories and taxonomy terms -> Change display mode. The “Multiselect with search” where there is placeholder text, no matter what we write there, it doesn’t change. We had to change it to “Dropdown”, because it works. But we eould really like to get that Multiselect with search placeholder working.