A nutrient deficiency of some type. We could search and narrow it down but first provide details on how the plant is being grown
Pot vs soil in garden and what nutrients
UPDATE
It looks like Magnesium deficiency
Magnesium.
The Mg-deficient leaves, show advanced interveinal chlorosis, with necrosis developing in the highly chlorotic tissue. In its advanced form, magnesium deficiency may superficially resemble potassium deficiency. In the case of magnesium deficiency the symptoms generally start with mottled chlorotic areas developing in the interveinal tissue. The interveinal laminae tissue tends to expand proportionately more than the other leaf tissues, producing a raised puckered surface, with the top of the puckers progressively going from chlorotic to necrotic tissue.
https://www.hazera.us.com/deficiency-...
Mg-deficient leaf
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