Layer field initially not showing in Mainsail GUI during printing

Setup:
Orange Pi 3 LTS (Armbian Bullseye) + BTT SKR 3 EZ
Mainsail - Moonraker - Klipper (all latest versions)

When first opening the GUI (or sometimes upon refreshing the webpage), the layer field isn’t showing while printing:

However, after switching to a different tab in the GUI and going back to the main tab, the layer field and currently printed layer number show up as they should:

(I wanted to include here a picture of this too but can’t due to new-user restrictions).

Anyone else experiencing this issue?