antd design select placeholder issues
set this.state.company to be undefined instead of null.
you should update as below:
<Select showSearch optionFilterProp = "children" placeholder = "Select Company" value = {this.state.company || undefined} ---- update this line name = "company" onSelect = "{this.handleCompanyChange}" >
It should be set to undefined instead of null or "" empty string.
this.props.form.setFieldsValue({ myFieldName: undefined})