Why Gurobi doesn't use provided warm-start basis?

def add_warm_start_basis(self,
                         basis: Basis) -> None:
    self.model.setAttr("VBasis", self.model.getVars(), basis.vbasis.tolist())
    self.model.setAttr("CBasis", self.model.getConstrs(), basis.cbasis.tolist()

@dataclass
class Basis:
"""Information of: vbasis and cbasis."""

vbasis: np.ndarray
cbasis: np.ndarray

def __post_init__(self):
self.vbasis = self.vbasis.astype(int)
self.cbasis = self.cbasis.astype(int)

The log output shows:

Set parameter TimeLimit to value 600
Gurobi Optimizer version 10.0.1 build v10.0.1rc0 (mac64[rosetta2])

CPU model: Apple M1 Max
Thread count: 10 physical cores, 10 logical processors, using up to 10 threads

Optimize a model with 1040 rows, 2090 columns and 4180 nonzeros
Coefficient statistics:
  Matrix range     [1e+00, 1e+00]
  Objective range  [1e+00, 2e+01]
  Bounds range     [0e+00, 0e+00]
  RHS range        [5e-05, 3e-03]
Iteration    Objective       Primal Inf.    Dual Inf.      Time
       0   -3.4600000e+32   5.550000e+32   3.460000e+02      0s
     204    6.4600639e+00   0.000000e+00   0.000000e+00      0s

It didn't say my basis is invalid and didn't say my basis is used as well, which looks strange to me. And it looks obvious that it didn't start from my given basis.

I have also verified the feasibility of my basis (otherwise, I guess the log will claim it is invalid, either).

As a supplement, when I turn the param "LPWarmStart" to 2, it will successfully use that basis; see the following log for the same problem (only differs in the set of LPWarmStart).

Set parameter LPWarmStart to value 2
Set parameter TimeLimit to value 600
Gurobi Optimizer version 10.0.1 build v10.0.1rc0 (mac64[rosetta2])

CPU model: Apple M1 Max
Thread count: 10 physical cores, 10 logical processors, using up to 10 threads

Optimize a model with 1040 rows, 2090 columns and 4180 nonzeros
Coefficient statistics:
  Matrix range     [1e+00, 1e+00]
  Objective range  [1e+00, 2e+01]
  Bounds range     [0e+00, 0e+00]
  RHS range        [5e-05, 3e-03]
Presolve time: 0.00s
Presolved: 663 rows, 1710 columns, 3415 nonzeros

LP warm-start: get starts with basis, then crush them
Crossover log...

       2 DPushes remaining with DInf 3.8200000e+02                 0s
       0 DPushes remaining with DInf 3.4600000e+02                 0s

      45 PPushes remaining with PInf 0.0000000e+00                 0s
       0 PPushes remaining with PInf 0.0000000e+00                 0s

  Push phase complete: Pinf 0.0000000e+00, Dinf 3.4600000e+02      0s

Iteration    Objective       Primal Inf.    Dual Inf.      Time
      50    6.5562846e+00   0.000000e+00   3.460000e+02      0s
     172    6.4600639e+00   0.000000e+00   0.000000e+00      0s

Solved in 172 iterations and 0.01 seconds (0.00 work units)
Optimal objective  6.460063894e+00

I am wondering why this happens. Any help or suggestions would be greatly appreciated. Thank you!