MatBlazor | Material Design components for Blazor and Razor Components | Frontend Framework library

I have a blazor server app that is a .Net 5.0 application deployed on AWS using AWS Beanstalk. It is a Single Instance deployment, so I currently can't use load balancing (due to current restrictions given to me). The deployed environment platform is "IIS 10.0 running on 64bit Windows Server Core 2019/2.6.3". When i run this locally on VS2019 and local iis server, the app works fine. But once deployed, it throws an error in the browser console:

I have a templated component (a tooltip) that has a parameter and passes that parameter in context to child content. That parameter is a wrapper for ElementReference. The purpose of this is to get back to the tooltip the child's reference, once it is set. What I want to do is to store a particular instance of that tooltip component in a reusable RenderFragment in several places. But I get the error The name 'context' does not exists in the current context.

This is original question, but it proved to be oversimplified. Please go to second separation line, with sample more resembling my situation.

Here is a sample (not that tooltip, but simplified code that has exactly the same problem).
Templated component RenderFragTempl:

I'm building hotel service web application and I'm want to use MatBlazor component called MatAutocompleteList for choosing clients for reservations I've encountered an issue when Client is selected like on the screen

And I remove this value leaving it blank and press enter application throws an exception:

I am pretty new to MatBlazor. I am trying to fill a MatSelectItem with some options after something happens.

Initial locations = new LocnamesItem[] {};

I have followed the installation instructions from https://www.matblazor.com/.

1.Add @using MatBlazor in main _Imports.razor

I am using the MatBlazor component library: https://www.matblazor.com/

and I am trying to understand how the designer for this website: https://blazor-wasm.quarella.net/Account/Login

centered the element like so:

My following code looks like this:

I have used the MatBlazor framework for my project. In MatSelect, I want to catch its value onchange event to do some other works. I have tried some solutions but the onchange event has not fired yet.

I have a Blazor page and want to do unittesting via bUnit with xUnit.

My Blazor-page:

I have a Login.razor the page where all the action happens.