Mine was confirmed by CW and submitted to development today (CWBRN-22238). It's just about previous takes muting some notes while recording takes. Below are the steps and results I submitted:
1. Load the Normal project template.
2. Drag a soft synth, say, SI-Electric Piano, from the Browser to the blank space of the Track View (selecting either a simple instrument track or audio/midi tracks).
3. Go to Edit -> Preferences -> Project -> Record, and select "Sound on Sound."
4. Enable Input Quantize ("1/16").
5. Set a loop between, say, Bar 1 and Bar 8.
6. Start recording three different takes in the same section, say, between Bar 2 and Bar 7.
[Expected Results]
During loop-recording, you hear every note you recorded in the previous take(s).
[Actual Results]
During loop-recording, you only hear some of the notes you recorded in the previous take(s).