This new version breaks compatibility with older curl version, causes build failures. So far Libreoffice and Kodi are effected, probably many more will follow.
Upstream has a discussion about this:
https://github.com/curl/curl/issues/926
Commit that breaks it:
https://github.com/curl/curl/commit/9adf3c473a01b289c781aab111f9ad2fc541ed4e
that commit also has discussions about incompatibility issues
KaOS will stay with the curl version in core, 7.49.1, until this is resolved upstream.
As always when you are on the build repo and notice a package is removed (warning that local version is newer then repo on pacman -Syu):
sudo pacman -Suu