AVR128DB48: OPAMP0 output (PD2) not driven in Voltage_follower example (DxCore 1.6.x)

[agysft]

I tested the NEW OPAMP Voltage_follower example on AVR128DB48 with DxCore 1.6.2.
https://github.com/SpenceKonde/DxCore/blob/master/megaavr/libraries/Opamp/examples/Voltage_follower/Voltage_follower.ino

Observed behavior

• DAC voltage is output on PD6.
• No voltage is observed on PD2 (OPAMP0 output pin).
• In DxCore 1.6.2, PD2 remains undriven.

Expected behavior

• PD2 (OPAMP0 output) should follow the DAC voltage (voltage follower).

Regression

• DxCore 1.5.11: PD2 outputs the expected voltage.
• DxCore 1.6.2: PD2 is not driven.

Steps to reproduce

1. Use AVR128DB48
2. Open the example above
3. Compile and upload with DxCore 1.6.2
4. Measure PD6 and PD2 (e.g., with a multimeter, oscilloscope, or using the internal ADC)

Note: No external circuitry is connected; using the example as-is.

Result

• PD6: DAC output OK
• PD2: no output (remains low or floating)

This may indicate a regression in DxCore 1.6.2.

Environment:

• MCU: AVR128DB48
• Bootloader: DB Optiboot (written with DxCore 1.5.11)
• Clock: 24MHz internal
• Arduino IDE: 2.3.8 / 1.8.19