fixed standin modulation bug

Author: deepbeepmeep

models/wan/modules/model.py

@@ -1308,7 +1308,7 @@ def forward(
             kwargs["standin_phase"] = 2
             if (current_step == 0 or not standin_cache_enabled) and x_id == 0:
                 standin_x = self.patch_embedding(standin_ref).to(modulation_dtype).flatten(2).transpose(1, 2)
-                standin_e = self.time_embedding( sinusoidal_embedding_1d(self.freq_dim, torch.zeros_like(t)) )
+                standin_e = self.time_embedding( sinusoidal_embedding_1d(self.freq_dim, torch.zeros_like(t)).to(modulation_dtype) )
                 standin_e0 = self.time_projection(standin_e).unflatten(1, (6, self.dim)).to(e.dtype)
                 standin_e = standin_ref = None