I have this problem where the catalog_product_index_group_price database table is flushed when I save a product. Only the product I'm saving is left in catalog_product_index_group_price.
After a reindex of the 'Product Prices' all group prices are regenerated.
When I change the setting of the 'Product Prices' indexes to 'Update on save' the problem does not arise.
Is this a general bug? Or am I having a conflict somewhere? I have not extended or overwritten any related core code.
Current version is CE 184.108.40.206