I'm sure these weren't visible before as I'm pretty OCD about things. But could they be there over time and due to weather conditions have now just become more visible? Just trying to understand the reasoning in them now appearing.They've been there since the brick was made.
I read that cracking through bricks themselves was more concerning but some of these are spread out over the wall outside. Not like in one concentrated area or a long line for example.
You seem to be one of the most knowledgeable blokes on here when it comes to questions like this so appreciate any advice.