Adafruit Snake Eyes Bonnet – TFTs backlit but no image

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I have a Raspberry Pi 3B with the Adafruit Snake Eyes bonnet and 2x IPS TFT ST7789.

I’ve soldered it all up, I can’t see any bridging and I’ve done continuity checks on each pin.
I’ve done a fresh install of Buster OS Lite Legacy and run through the software setup on the guide – learn.adafruit.com/animated-snake-eyes-bonnet-for-raspberry-pi/

When the Pi boots, I can see the animated eyes if I plug in a HDMI cable, however the TFT screens are backlit but don’t display anything at all.

I’ve run the following command:

sudo i2cdetect -y 1

Which returns:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Does this mean the Pi can’t see the TFTs?
I’m quite new to this so any guidance appreciated. What would be the next step to troubleshoot?

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