I understand the concern about thiamine causing refeeding syndrome, but despite a lot of discussion about it possibly causing potassium deficiency I haven't seen a single primary source that confirms that. That might be because i'm not parsing things too well with my brain fog, so correct me if Im wrong.I think the concern is that thiamine supplementation induces refeeding syndrome, in which potassium and electrolyte depletion is a possibility. On the other hand, correcting a thiamine deficiency may also normalise electrolyte imbalances. I reported the following earlier in another thread.
Acute thiamine deficiency and refeeding syndrome: Similar findings but different pathogenesis
A similar finding from this case report:
Thiamin and folic acid deficiency accompanied by resistant electrolyte imbalance in the re-feeding syndrome in an elderly patient