I already did and suggest you do the same. Which seller did you get it from?
https://www.aliexpress.us/item/3256806177226619.html is confirmed bad, waiting to hear from seller.
https://www.aliexpress.us/item/3256806254319466.html is in the mail and looks like it will also be bad 
They sell an “unwelded” version which would allow me to solder the rPi connector on the correct side, but of course I ordered the pre soldered one, because it’s not like I need more soldering jobs.
Of course, now I have an unsoldering/resoldering job which is even worse :-/
Maybe it’s a good time to figure out if I can learn to use my heat gun to unsolder all those pins at once.
I got mine refunded, they didnt even let me contact the seller. I got 2€ back tho so I guess yay?
https://aliexpress.com/item/1005006838274518.html
is the one I got, I hope the link didnt break
We should probably write some reviews warning folks with both the active passive thing which seems to be less of an issue and the solder issue which seems to affect all of these so thats (un)cool
I replied to all 3 amazon sellers to give 1 star reviews and photos.
Please rate your own seller on aliexpress with 1 star review too.
In the meantime I received the blank board unsoldered, soldered it myself the correct way and it works fine.
With
root@DietPi:~# ~/rpi-rgb-led-matrix/examples-api-use/demo --led-slowdown-gpio=4 --led-panel-type=FM6126 --led-rows=64 --led-cols=128 --led-row-addr-type=3 --led-chain=1 --led-parallel=2 --led-show-refresh --led-scan-mode=1 --led-pwm-bits=4 --led-pwm-lsb-nanoseconds=50 -D0 --led-pwm-dither-bits=1
I get 350Hz on 2 ABC panels (128x128 total res)
This shows the correctly soldered board on left, then the incorrect one, the incorrect one I tried to unsolder (oh boy, what a mess), and a blank board with the connectors put in the correct way (not soldered yet)
@marcmerlin could you share the link of this P1.87 128x64 pannel ? What type of chipes are?
I got them from https://www.aliexpress.us/item/2255801134833289.html
sorry, can’t go find them and take chipset pictures for you now, but they are ABC and work with the lib