I can't save extended piston

Steps to reproduce bug :
At first, place the piston and press the F key to extend the piston.
After then, save and load the machine.
The piston should be loaded while stretched, but in reality the piston will be loaded at the retracted position with the extended setting.
This is why I can't save extended piston.

I'm sorry I couldn't find the file, "output_log.txt".

Operating System : macOS High Sierra 10.13.3
System Specs : MacBook Pro (Retina, 13-inch, Early 2015)
2.7 GHz Intel Core i5
8 GB 1867 MHz DDR3
Intel Iris Graphics 6100 1536 MB
Game Version : Steam Edition v0.60.0-6437