I am going to be a "nay-sayer" again on the calcium deficiency.
As it grows, all plant tissue needs a steady supply of calcium. Unlike most other nutrients, calcium is not well transported within the plant - once absorbed and used, it is "locked down" - so old tissues cannot supply it to newly-growing ones.
That being the case, the classic symptom of calcium deficiency is the blackening (death) of new growths as they emerge from the plant. In these photos, it is apparently that they grew fine and then contracted an issue. This could only be a calcium deficiency if it had been adequately supplied, and then stopped altogether when the growths were partially mature.
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