Issue with Previous MIDI Parts Playing During Recording in Cubase 13.0.50

I am encountering an issue in Cubase 13.0.50: when recording MIDI on a track in Stacked mode with New Parts enabled, previous lanes continue to play simultaneously with the new one. This happens in both linear and non-linear recording modes.

In the past, when recording, the previous lane of the track would be muted, but now it continues to play while I record. Additionally, when recording in a loop and stopping the recording, the last recorded lane in that take begins to play along with the already playing lanes.

I’ve tried resetting Cubase to factory settings and creating a new project with only one MIDI track, but the issue persists. In Replace mode, everything works correctly, but I need to retain all lanes on the track.