Select Tag multiple doesn`t show selected values if there are more than one value

[Ilkrash]

I have a field that is described in view as
<%= f.SelectTag("Country", {class: "selectpicker", multiple: true, data-live-search: true, options: countries, required: true})
In model I have a field
Country slices.String `json:"country" db:"country"
In action this model is provided to the template
If there is only one country in slices.String array, it is being displayed properly in the edit form, but if I have more than one country selected, no selected countries are displayed at all.

if I provide selected countries manually, I get all of the selected countries

c.Set("selectedCountries", project.Country)
return c.Render(200, r.Auto(c, project))
<%= f.SelectTag("Country", {class: "selectpicker", multiple: true, data-live-search: true, options: countries, required: true, value: selectedCountries})``` 

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[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment. Otherwise, this will be closed in 7 days.