Apply matrix trimming after preconditioning

tidy3d/plugins/mode/solver.py

@@ -496,10 +496,6 @@ def any_pec(eps_vec, threshold=0.9 * np.abs(pec_val)):
         mat_dtype = cls.matrix_data_type(eps, mu, der_mats, mat_precision, is_tensorial=False)
         mat = cls.type_conversion(mat, mat_dtype)
 
-        # Trim small values in single precision case
-        if mat_precision == "single":
-            cls.trim_small_values(mat, tol=fp_eps)
-
         # Casting starting vector to target data type
         vec_init = cls.type_conversion(vec_init, mat_dtype)
 
@@ -549,6 +545,10 @@ def conditional_inverted_vec(eps_vec, threshold=1):
                 generalized_M = precon_left @ generalized_M
                 mat = precon_left @ mat
 
+        # Trim small values in single precision case
+        if mat_precision == "single":
+            cls.trim_small_values(mat, tol=fp_eps)
+
         if analyze_conditioning:
             aca = mat.conjugate().T * mat
             aac = mat * mat.conjugate().T