The problem is the hydraulic lime, it's not capillary active enough to dry out a wall. Hydraulic lime should only be used when you want to create a moisture barrier: only use it for foundation work or places that are submerged in water.
The appropriate fix here is to remove the render...
What kind of Lime? The wall looks damp (the green stuff). So I'm gonna guess it's hydraulic lime, which is not the right kind of lime to use on a wall above ground.
it's chaux hydratée. I don't know what the frenchies use, but in Belgium I use Supercalco (made by carmeuse) when I use hydrated lime. Of course, I'm too cool for hydrated lime so I use Supervical, which is quicklime.
I think you should be able to find Supercalco or Supervical in France. It's...
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