Only one placeholder per component is supported

[galiana]

If I create 2 or more dynamic placeholders in the same component, the ID of the second ends with _1, _2, and so on.
The save event, deleting orphan components, deletes the rendering on these placeholders.
The same issue occurs if we use the uniqueKey parameter, as it is added as _"xxx" to the placeholder.
An MVC view example:
for (int i = 0; i < 5; i++)
{

@Html.Sitecore().DynamicPlaceholder("ContentLayout",false)

}
}