I can't enter characters from the keyboard into a mathtype box inside popup

[hungakt2001]

Description

What does the bug consist in?
I can't enter characters from the keyboard into a mathtype box inside popup, but outside i can do it
I can type

I can't type

Environment

Which version of MathType does this happen in?
8.11.1
What is the relevant software and their versions?

.NET 8

• Framework (Angular, React, etc.) \\ .NET Core (API)
• Browser (Chrome, Firefox, etc.) \\ Almost all browsers (Edge Version 130.0.2849.56, Chrome Version 130.0.6723.70)

Steps to reproduce

What are the steps needed to reproduce the bug?

1. I wanna try use mathtype box in my web, It still works fine if I leave it outside. (1st picture)
2. I put it inside a popup (2nd picture) and then I can't enter characters from the keyboard.

This is my code

Expected result

I wanna know reason and how to fix it