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Warning.
The SSD drive installed at the bottom of the Raspberry board can interfere and Z-Way does not see the RaZberry 7 Pro with external antenna.
I had to connect the drive with a 50 cm USB cable.
From my own experience.
Case for example:

Do you mean that the presense of the SSD behind the Pi affected UART communication? Sure there were no short circuit or bad wiring?

Maybe it coincided.
I install Z-Way on SD card - everything works
I install Z-Way on an SSD drive - and Z-Way does not see RaZberry 7 Pro
I install Z-Way on an SSD drive via USB cable - everything works
And so twice, then I got tired of experiments, left it on the cable.