This seems to be an OS related problem, I can reproduce what you see with CbB on Windows 7: Lasso-select a single envelope node also selects all other nodes in the range of the (underlaying) clip. "Select Track Envelopes with Clips" has to be checked.     The problem doesn't occur with Windows 10 here, works as expected. CbB Version: 2019.09 (Build 70)  
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