I recently got an alocasia and noticed one of the leaves started to droop. I assumed it was root rot, but I checked the roots and they look white and healthy. I cut away as much of the rotten plant stalk as possible but there is still some rotten flesh that goes into the base of the plant and inbetween (see pictures).

Will the rotten fleshy parts of the plant 'infect' the rest of the plant? Do I need to check deeper within the plant for rot? Is there anything else I can do to stop further rotting?

I really appreciate any help, thank you.