String glitched when broken by piston.

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Summary:

String moved by piston connected tripwire hook causing string go weird. 

Step to reproduce:

1. Create string (long) and place 2 tripwire hook in block
2. Place piston next to string
3. Turn on

Observed results:

This string was glitched. 

Expected results:

The string should be disconnected from the tripwire hook when one of the strings is broken by the piston.