The semi-annual toolchain update has been done first weekend of March. This meant a move to GCC 8.3.0, Glibc 2.29, Binutils 2.32, latest linux-api-headers and some fifty packages rebuild due to some GCC API changes.
Frameworks was updated to 5.56.0 last weekend and the KDE Applications 18.12.3 were build on all this during last week.
Also included is a sizable rebuild due to new x264, new LibreOffice, updated polkit build on complete new way done js (now build according to Linux From Scratch) and many more updated that stayed in the build repo until the toolchain was ready to move. So in all this update is close to 600 packages.
Make absolute sure your mirror is synced prior to starting this update.