DinimixisDEMZ
When we move the LTS kernel to a newer LTS branch like we just did 6.12->6.18 we first wait for that new LTS to mature before switching linux-lts to it and ask users who are on the existing LTS kernel to switch back to linux-current for awhile to test it and find any issues because it will be their new LTS soon. Once the switch occurs both kernels will be the same for a period of time.
From memory this usually results in at least 1 kernel series being skipped. So I assume we will never get 6.19.x.
This reduces the workload because updating a kernel from 6.18.x->6.19.x is more effort than 6.18.20->6.18.21 and due to the additional wait time while the LTS matures it means you would get significant changes requiring more effort close together for linux-current 6.18.x->6.19.x->7.0.x