Yep::
- Kernel: The installer now additionally installs linux-cachyos-lts as a secondary/backup kernel after installation. We still recommend using the Stable kernel.
- ISO: Switched the live ISO’s kernel from Stable to LTS due to ongoing issues with the Stable kernel, improving boot reliability.
As far as Discover goes it’s been reported as buggy still. 
To my findings I never had flatpak installed from the installer. (Manual Install)
And welcome @msmafra