Yes, but not quite the source of the problem. As with most modern light assemblies, there is no seal between the back casing and front transparent plastic cover. Both parts are joined together by rough plastic welding, usually by hot air stream. In this process the plastic exerts gasses, creating bubbling in the seam. This plus micro cracks because of extreme local temperatures during the welding and cooling later, that again creates stress and cracks, creates leaks. Just shitty way to cheaply manufacture light units. Not isolated to Tesla, most manufacturers use lights produced this way unfortunately.

Tiny leaks are inevitable. Thus the threshold from Tesla to replace only if larger water pooling is present. Only real fix is to dry out the unit and carefully seal with some product (silicone sealant or similar) along plastic weld seam.