Cannot upload after stopping debug session (on MKR ZERO+Atmel-ICE)

[felias-fogg]

Describe the problem

After ending a debug session using Atmel-ICE and an MKR Zero, one cannot upload new code. The upload protocol stops with "Performing 1200-bps touch reset on serial port ..." and nothing happens anymore.

After pressing RESET, uploads are possible again.

To reproduce

1. Connect an Atmel-ICE and MKR Zero as described in the Arduino documentation https://docs.arduino.cc/tutorials/mkr-wifi-1010/atmel-ice/.

2. Upload the Blink sketch.

3. Start debugging.

4. Finish debugging by pressing the "Stop" button.

5. Upload the same or a modified sketch by pressing the "Upload" button.
   After compiling the sketch, the upload protocol does not proceed beyond "Performing 1200-bps touch reset on serial port ..."

Expected behavior

The upload command should succeed.

Arduino IDE version

2.3.7-nightly-20250717

Operating system

macOS

Operating system version

15.5

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details