Controller is after rename of solution not avaible - asp.net-core

Question

I have rename my main solution. My controllers are in another solution. The main solution has a dependencie on the rest-solution. All solution worked very well, but one is not avaible under the old route. I do not change the route of the controller.
Old route before renaming was [Route("api/identity/user")]. If i used it, i get only the errorpage.
Here's what I found out:
If i changed it to another route like [Route("api/identity/asdf")] or [Route("api/identity/user_old")] the controller worked very well.
Clean Solution and Restart Visual Studio don't help
Change port of launchsettings don't help
Moving file to another folder don't help
Deletion bin folder from main-solution don't help
i can access to old route (if it config) with postmen, but not with swagger or my blazor wasm frontend
with Postmen i arrived my breakpoint, with swagger or blazor wasm i get nothing
on all routes i get a log like: Request starting HTTP/1.1 GET https://localhost:44344/api/..., but on my specific route it is different
with postmen i get the log, but not with blazor wasm or swagger
I don't understand, where is the problem.
Edit 1: More Code
This not worked
[Route("api/identity/user")]
[ApiController]
public class UserController : CustomControllerBase<UserController>
{
private readonly IUserService _userService;
public UserController(IUserService userService, ILogger<UserController> logger) : base(logger)
{
_userService = userService;
}
/// <summary>
/// Get User Details
/// </summary>
/// <returns>Status 200 OK</returns>
[HttpGet()]
[AllowAnonymous]
public async Task<IActionResult> GetAll()
{
var users = await _userService.GetAllUsersAsync();
return Ok(users);
}
}
And this worked
[Route("api/identity/users")]
[ApiController]
public class UserController : CustomControllerBase<UserController>
{
private readonly IUserService _userService;
public UserController(IUserService userService, ILogger<UserController> logger) : base(logger)
{
_userService = userService;
}
/// <summary>
/// Get User Details
/// </summary>
/// <returns>Status 200 OK</returns>
[HttpGet()]
[AllowAnonymous]
public async Task<IActionResult> GetAll()
{
var users = await _userService.GetAllUsersAsync();
return Ok(users);
}
}