The Camino de Invierno was only formally accepted into the
Camino de Santiago network a few years ago (2015 IIRC). This followed a lot of research and review by the relevant authorities governing such an accession. So, much of the signage and directional arrows are dynamic.
Over time, the ubiquitous, painted yellow arrows will likely emerge as being dominant. For the moment, the locals are being creative and proactive, to get their villages established on the Camino de Invierno as soon as possible. I happen to like the woden signs, but standardization is the way to go, at least IMHO.
Another example of differences on this route is that the mojones (distance markers) are made of black slate when you are in the Bierzo region. Yet, all dimensional features and markings are standard. As soon as you cross the river into Galicia, the markers change to the granite type we are all more familiar with.
The first time you see the black ones coming out of Ponferrada, you scratch your head and wonder. That is, until you realize that slate quarrying is a major industry in the Bierzo, while granite quarrying is dominant in Galicia. Makes perfect sense to me...
Insofar as I know from my experience last spring, the practice of "pirating" pilgrims using misdirection and vandalizing signs has not yet spread to the Camino de Invierno. As this route becomes more used, this cynical practice will likely creep in. Just be aware...
Be patient and have a secondary means of navigation. A guide book or app fills this need nicely.
Hope this helps.