Url.Action and culture in ASP.Net core

Question

On my bilingual site (English & Spanish) developed using ASP.Net Core 3.1, I have 2 distinct views (staff and program) populated by their own controller/viewmodels which contains the exact same links:

<a href='@Url.Action("Detail", "Staff", new { nodeAlias= "JohnDoe" })' class="...">TEST STAFF</a>
<a href='@Url.Action("Detail", "Program", new { nodeAlias="group1"})' class="...">TEST PROGRAM</a>

These links are associated with routes such as the following:

     endpoints.MapControllerRoute(
            name: "ProgramDetail",
            pattern: "{culture}/Research/Program/{nodeAlias}",
            defaults: new { action = "Detail", controller = "Program", culture = DefaultCulture, nodeAlias = "default", nodeParent = "Research" },
            constraints: new { culture = new SiteCultureConstraint() }
        );
            endpoints.MapControllerRoute(
                name: "AboutStaff",
                pattern: "{culture}/About/Staff/{action}/{nodeAlias?}",
                defaults: new { action = "Index", controller = "Staff", culture = DefaultCulture, nodeParent = "About" },
                constraints: new { culture = new SiteCultureConstraint(), nodeAlias = new AlphaRouteConstraint() }
            );

The default culture is English and it works file in this language.

However, I am having issues when I switch to Spanish. For example, In Spanish, when I am on the program page, the program link is correctly built (eg.:/es/Research/program/group1) while the link is wrong for the staff page (en/About/Staff/Detail/johnDoe). But if I switch to the staff page which contains the exact same links, i get the wrong culture for the program link (/en/Research/program/group1) but the good one for the staff page (es/About/Staff/Detail/johnDoe).

It looks like the pattern is that links generated by url.action are using the current culture only on the pages from the matching controller/viewmodel/context.

It is quite unclear to me if it is normal and why I have this behaviour. Anyone could explain it to me and how to solve it?

Thank you,

S.