Comment # 29 on bug 1192457 from Fabian Vogt

The live CDs fit again after avoiding double-compression (both squashfs and the
initrd), like suggested by comment 11:

# Decompress kernel modules, better for squashfs (boo#1192457)
find /usr/lib/modules/*/kernel -name '*.ko.xz' -exec xz -d {} +
find /usr/lib/modules/*/kernel -name '*.ko.zst' -exec zstd --rm -d {} +
depmod $(basename /usr/lib/modules/*)

The size of the .iso shrank from 703MB to 619MiB!