PJON and Minicore not working

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Hello,

I'm encountering an issue with the PJON protocol and the Minicore bootloader on a 328P-PU. The upload works fine, the Atmega starts and tries to connect to the gateway, but nothing comes out of the BUS PIN of the Atmega 328P-PU! The gateway doesn't receive any information.
Using the official NANO bootloader works. I should mention that the setup is on a PCB, so there are no bad connections.
If you have any ideas, I'm open to making it work. Thanks.