Devon Timber Windows NZ

This is why I'm not a fan of glazing with silicone.
As you can see from this picture once you get water ingress its got no where to go so it just soaks through the timber.
This is a not very old cedar door, its probably the worst case of rot I have ever seen in cedar which is generally pretty hardy stuff.
So for single glazing use tried and tested oil based putty and for double glazing always choose a "dry system" such as Thermawood.