Piano Reverb/Sustain in Playback

I'm working on a piece which has three pianos. In it, I realized that the second piano was sounding in the playback as though it had a pedal marking, despite no marking for pedal being in the score. I checked the mixer and also saw that the "reverb" option was not enabled. I've tried remaking the file and pasting the original music, rewriting the music from scratch, and even testing the issue on other files, but the same reverb issue always happens in the second piano part.

Steps for reproduction:
1. Open a new file
2. Add three pianos in the instruments list
3. Write any music in the 2nd piano part
4. Press space or playback button

Other info: I haven't seen if this was an issue in versions prior to 3.6, and as far as I know of, this is the first time I've seen the issue in general. It's been reproduceable every time I've tried a new three piano score, and I haven't found any form of workaround for it. I've also included a file which will hopefully demonstrate the issue, since I don't know if it's an issue with only my laptop or not.

If there are any workarounds for this issue, please let me know. Thank you!