I got a deprecation notice here:
Deprecation notice: The icon name “arrows-alt-h” has been updated to “left-right”. Please use the new name in your code. Old names will be removed in Q2 2025. [deprecation id: discourse.fontawesome-6-upgrade] [info: We're upgrading our icons to Font Awesome 6! ]
Maybe also other icons than arrows-alt-h are affected, I did not check, yet.