Spring mvc - POST request with #ModelAttribute cause unnecessary sql queries - spring

Question

I have a form with three select inputs, which are added from the db in the view. Everything is OK and the user can select for every select. The problem is that when I submit the form, the #ModelAttribute generates the same queries as the GET request (when these three selects are added into the view) and in the same, the select fields are empty after the POST.
#GetMapping("/road-assistance")
public String viewPage(Model model, Locale locale) {
model.addAttribute("roadAssistanceDto", roadAssistanceService.createRoadAssistanceDto(locale, null));
return "admin/roadassistance/view";
}
#PostMapping("/road-assistance")
public String createRoadAssistance(Model model, Locale locale,
final #Valid #ModelAttribute("roadAssistanceDto") RoadAssistanceDto roadAssistanceDto,
BindingResult bindingResult) {
if (bindingResult.hasErrors()) {
return "redirect:/";
}
return "admin/roadassistance/view";
}
Why the #PostMapping generates the same queries and in the same time, I don't have the info in the view/model?
the view -
<div class="row card-pagging">
<div class="col-sm-2 mt-3 offset-sm-2">
<label data-th-text="#{control.panel.roadassistance.country}"
class="control-label"
for="country">Country</label>
<select id="country" data-th-field="*{country}" class="form-control">
<option data-th-each="countryList : ${roadAssistanceDto.countryList}"
data-th-value="${countryList.id}"
data-th-text="${countryList.countryI18n[#locale].name}"></option>
</select>
</div>
<div class="col-sm-3 mt-3">
<label data-th-text="#{control.panel.roadassistance.region}" class="control-label"
for="region">Region</label>
<select data-th-field="*{region}" id="region" class="form-control">
<option value='' data-th-text="#{control.panel.roadassistance.chooseregion}"></option>
<option data-th-each="reg : ${roadAssistanceDto.regionList}" data-th-value="${reg.id}"
data-th-text="${reg.regionI18n[#locale].name}"></option>
</select>
</div>
<div class="col-sm-3 mt-3">
<label data-th-text="#{control.panel.roadassistance.city}" class="control-label"
for="region">City</label>
<select data-th-field="*{city}" id="city" class="form-control">
<option value="" data-th-text="#{control.panel.roadassistance.chooseregion}"></option>
<option data-th-each="city : ${roadAssistanceDto.cityList}" data-th-value="${city.id}"
data-th-text="${city.cityI18n[#locale].name}"></option>
</select>
</div>
</div>
And the RoadAssistanceDto -
public class RoadAssistanceDto implements Serializable {
private Long id;
private Country country;
private Region region;
private City city;
private List<Country> countryList;
private List<Region> regionList;
private List<City> cityList;
/* GETTERS AND SETTERS /*
}
Hm... I think that I notice the problem.. there is something workng when I'm binding the fields in the thymeleaf... but anyway, why is generating these queries?