[BUG] Upsert with igrouping, cause duplicate id

[iyumot]

Version
.NET 10 , DB 5

if g is ienumrable
foreach (var item in g.GroupBy(x => x.Source))
table.Upsert(item);

This causes data with duplicate Ids. because item is igrouping.

table.Upsert(item.AsEnumerable()); this is ok