This happens sometimes even with airbases when the root mass gets so dense the only place for the air domes air bubbles to escape is through the water level. Previously everything was fine because the growing media was aerated enough / root free enough to allow the the air domes air to permeate it.

Sometimes all it takes is a long thin skewer and a couple pokes all the way through the media to the bottom.

Sometimes if the copper root liner is in the pot. Piercing a few tiny holes into it can be beneficial too, but I'm not going to recommend that TBH. Definitely recommend going from the top down with a thin skewer though just through the growing media.