Not that much of a problem for defensive positions. They can be fortified, and successfully attacking a tank is difficult either way, especially for an amphibio

Not that much of a problem for defensive positions. They can be fortified, and successfully attacking a tank is difficult either way, especially for an amphibious force with limited munitions and firepower available. And without night vision gear (prototypes were only available by 1945), the only options are flares (which would aid attackers as much as defenders), or search lights (which are much harder to destroy this way).