Error when concatenating WASM circuits

[yao-cqc]

from pytket import Circuit
from pytket.wasm import WasmFileHandler

wasfile = WasmFileHandler("add1.wasm")
c = Circuit(1)
a = c.add_c_register("a", 8)
c.add_wasm_to_reg("add_one", wasfile, [a], [a])
d = Circuit()
d.append(c)
d

shows empty list: []

Adding ops to d can even lead to crash

wasfile = WasmFileHandler("add1.wasm")
c = Circuit(1)
a = c.add_c_register("a", 8)
c.add_wasm_to_reg("add_one", wasfile, [a], [a])

d = Circuit()
for bit in c.bits:
    d.add_bit(bit)
    d.add_c_setbits([False], [bit])
d.append(c)
d