Hadn't seen this before - I wonder if that was once on the potato outside and then grew closed?
this post was submitted on 31 Mar 2024
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This is referred to as hollow heart.
It usually indicates as shortage of available calcium in the plant as the tuber grows. Basically the same thing as blossom end rot in tomatoes, peppers etc.
Some varieties are more prone to developing this than others.
today I learned :)
Hot dog! I knew there'd be a juicy explanation in the comments. Way to be my dude.