Output Filter Components Breaking Class D Amplifier Chip
CLass "D" amps like SMPS cannot be tossed into a breadboard to make work.  Mutual coupling of wires from coil current and 10nH/cm can make a big difference to work or fail.

I experimented with their design to see why and in theory it should not oscillate, but in your layout it does.

Making another tank circuit seems to help.

But we need more details on your design differences.

You can simulate here


But while you are learning these tools and effects of anti-resonant currents, it is wise to have an adjustable DC current limiter for bench testing to save on fried parts.

This intersection of RLC is consistent with the simulations