Failed to synchronize AUR database

Pamac --version

Pamac 10.4.3-1 - libpamac 11.4.1-1

Variant in use

GUI and CLI

Distribution

e.g. Manjaro

Desktop environment

KDE Plasma and GNOME

What's not working

When synchronizing package database i always get:

https://aur.manjaro.org/packages-meta-ext-v1.json.gz: Unacceptable TLS certificate
Failed to synchronize AUR database

How to reproduce?

Regardless if done from GUI or CLI - i noticed this first on unstable branch install i have, reproduced on the second install and then i could reproduce on my testing branch install.