Six years ago I bought 10m of this weird led strip in OBI:
Another thread mentioning this strip in German:
It runs on 12v, 3 diodes per segment, the pins are as described: VCC GND GND DI/DO.
(From earlier testing I found out the middle gnd pins are exactly the same, it runs perfectly with just one gnd connected to the original controller.)
I tried plugging it to Arduino running FastLED (as ws2811) and NodeMCU v3 running WLED with a 12v power supply attached, sadly with no success. It seems to respond to commands but flashes random colours on each segment. It doesn't react to turning off and after many sent commands it settles on one "combination".
I doubt anybody has a similar led strip, but I would really appreciate any tips that would help me to get it running.