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Describe the bug
When the process involves sub-processes, the complement operation will only take the start time, and will repeat the number of days to perform the complement.

To Reproduce
Steps to reproduce the behavior, for example:

1. Create a simple sub-process, such as a shell
2. Create another main process and associate sub-processes
3. For complement operation, you can also make up only two days

The specific operation is as follows：

1. Create subprocess，
   

2. Save subprocess and setting variables
   

3. Create the main process and create sub node as in main process
   
   

4. Save main process and setting variables
   

5. As follow.
   

6. Then complement
   

7. The result is as follows, the date printed is only the start date
   
   
   

8. The timing of the main process is correct
   

Which version of Dolphin Scheduler:
-[1.2.1]

• Stand-alone deployment