My yucca has been fairly droopy for a while. Approximately a month ago, a new shoot started growing from the soil. I let it all be for a month but decided to cut the large trunk to give the new shoot a better chance. When I did this, I saw it is completely black inside. This does not seem good! What shall I do? Any help would be very much appreciated. I am a complete novice but wouldn't want to see any harm to any living being.