The Dropdown Menu Doesn't appear When TB_megamenu in the Nav

Problem/Motivation

The Dropdown Menu Doesn't appear When place the TB_megamenu in the Nav block in block layout.

Steps to reproduce

1. Install Radix 6 theme. Add Bootstrap js / css settings.
2. Add menu items hierachically in the default main navigation.
3. Composer install the TB_Megamenu module and Activate it.
4. Create a TB_M Main menu.
5. Place the menu to the Navbar Left or Navbar Right or SiteBranding block.
6. Save and watch the output:it renders the menu but on mouse hover or click no dropdown menu appeared.
7. Place the menu to the Content block and save. This time the menu worked as expected with megamenu shown on hover.

Proposed resolution

I don't know the resolution. Request for your help. Please.

Remaining tasks

User interface changes

API changes

Data model changes