Same here, tried several fixes which worked with varied results. In the end I still see some condensation after a touchless car wash or a rain.
Remediation Fixes (tried so far) -
1. Run air pump (air bed inflator pump) in low speed, with the nozzle pointed in to the assemble (remove headlight caps)
2. Removed both the assemblies and applied the Black Gasket Silicone around the entire edges (where the plastic glass meets the black plastic)
3. Added additional Silica Desiccant packs in to the assembly (Duct tape the packs under the headlight caps and put it back)
4. Installed Extra Weather Strips on top and sides, so any water directly hitting from front/sides do not seep in to the headlight.
Interesting observation is, even after all the fixes above, the condensation occurs on the passenger side (US Model). My theory is that, there is quite a free space behind the lights with the cold AC Lines
running right behind the vent holes of the right headlight (passenger side). In wet conditions, chances of sucking in the air/moisture is more.
If you have any workable solution, please do share.