I don't know the exact answer but the NET specialist sent this message to me just today.

"Indigestion” of any sort, occurring within the first week of Sandostatin or Lanreotide is very common (20-30%) and related to pancreas enzyme insufficiency (SS receptors on both exocrine and endocrine pancreas). A1c will go up by ~0.5% also."
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I like to use artificial intelligence to translate what my doctors say so that it makes more sense to me. My question pertained more to indigestion but my doctor included the bit about HbA1c elevations.

Artificial Intelligence explains it this way:

"The Mechanism: The endocrine pancreas contains beta cells (which secrete insulin) and alpha cells (which secrete glucagon), both of which feature somatostatin receptors.

The Effect: Sandostatin and Lanreotide inhibit the secretion of both insulin and glucagon. However, their inhibitory effect on insulin is typically stronger than their effect on glucagon.

The Outcome: Because insulin secretion is suppressed, blood glucose levels rise, commonly resulting in a mild increase in HbA1c of about 0.5%."