Temporary solution:
1. Install downgrade
2. Then run
sudo downgrade qt6-svg qt6-base
then in each package select the 6.7.0 version.
Optionally, add both packages to the ignore list. Just keep in mind that you'll have to remove them later when you finally decide to update them. How?
sudo nano /etc/pacman.conf
, checking the line IgnorePkg = <name of the packages>
and commenting it out.
3. run obs as you usually do.