Sub Workflow - Execute Workflow counts towards Monthly executions on n8n cloud

Hello! Is it anywhere specified how execute workflow / sub workflow counts toward Monthly executions on n8n cloud?

In my personal testing sometimes it counts some other time it doesn’t count which makes it confusing and hard to understand when to use it.

They currently do not count. Can not think of a case right now where they would.

is there a way to see the history of the monthly execution count?