Bugfix: Zero-initialize padded posq buffer in AmoebaCommonKernels (#5071)

Co-authored-by: chenlei.2333 <chenlei.2333@bytedance.com>

plugins/amoeba/platforms/common/src/AmoebaCommonKernels.cpp

@@ -263,6 +263,10 @@ void CommonCalcAmoebaMultipoleForceKernel::initialize(const System& system, cons
             localDipolesVec.push_back(0);
         for (int j = 0; j < 5; j++)
             localQuadrupolesVec.push_back(0);
+        if (cc.getUseDoublePrecision())
+            posqd[i] = mm_double4(0, 0, 0, 0);
+        else
+            posqf[i] = mm_float4(0, 0, 0, 0);
     }
     dampingAndThole.initialize<mm_float2>(cc, paddedNumAtoms, "dampingAndThole");
     polarizability.initialize<float>(cc, paddedNumAtoms, "polarizability");