Meyer lemon seed germinated inside fruit?

Question

My father has a meyer lemon dwarf tree growing in san jose, ca. I picked a bag full of fruit and drove home to paso robles, ca. The next morning i peeled a lemon and i found what you see in the picture i attached.is this common?

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Answer 1

I forgot to mention, he left a few pieces of fruit on the tree from last year, so i dont know if this was one of those but it was soft when squeezed but not mushy?