Cobblestone Pillar for Mineshaft

In this last snapshot [21w10a], I noticed that Oak logs pillard from Mineshaft were sometimes placed into lava, ans I think that it's a little bit dangerous. So as like chains that support suspended footbridge when the cave floor is too far, I think that wood pillard should be partially replaced by cobblestone/other type of non-flammable blocks when the pillar is places into lava.