Landmarks are now on a cycle of activity. What this means is that they
are only able to be swayed one way or another (using the existing
methods) during the first 6 months of every odd Achaean year. The rest
of the time they will not be able to be affected. This means you need to
rally to change them during the period of activity.

HELP LANDMARKS now mentions this as well.

Aeyr

Penned by my hand on the 3rd of Glacian, in the year 284 AF.