durable-task 1.8 breaks workflow bat steps

After updating durable-task from 1.7 to 1.8 workflow builds execute bat steps and hang.
Example of workflow script:
node {
bat 'python TaskFor1C.py'
echo 'end'
}
In TaskFor1C.py start program (1cv8.exe) with parametr using metod subprocess.call(). Program start and working as expected but after close workflow hang and in log little spinning icon, but need 'end'.
After switching back to durable-task version 1.7 everything is working again as expected.