Stunner - Creating sub-process inside sub-process places a new one outside the sub-process

Create (Embedded) sub-process. Create any node inside sub-process. Append Embedded sub-process using toolbox menu. Actual result The new sub-process is placed outside the sub-process. See sub-process_outside_of_sub-process.png Expected result If there is not enough space for new sub-process, it is not created with the warning message why it has happened. If there is enough space, the new sub-process is placed inside the sub-process.