Target cable with twisted pairs

Step 1:Use separate unshielded wires to minimize capacitance and reduce crosstalk.
Step 2:If the problem persists, add a capacitor of approximately 22 pF (acceptable range 18–27 pF) between CLOCK and GND on the nails, as close as possible to the MCU.
Step 3:If the issue still exists, add a similar capacitor (≈22 pF) between DATA and GND on the nails.
If the issue continues, consider additional methods such as:
Using twisted pairs
Adding termination resistors
Applying partial shielding
Other EMI reduction techniques
For more details, see the document: https://softlog.com/documents/Filter%20for%20long%20cables.pdf