No arrows in submenus

[jawsoftware]

As I updated to Big Sur, all my hammerspoon based menus lost the submenu arrow, making difficult to recognize if a menu item is a submenu or not.
This is a sample hs menu with submenu opened:

This is a system menu with submenu:

[cmsj]

How are you creating the menu? With a static menu table I get the disclosure glyphs:

[jawsoftware]

Same problem using your sample code:

The issue doesn't happen running on Mojave.
This issue also occurs with two or three other apps. All the others work fine.