diff --git a/src/Val.cc b/src/Val.cc
index bf86360b70..e82f0e9c1b 100644
--- a/src/Val.cc
+++ b/src/Val.cc
@@ -3241,10 +3241,11 @@ bool VectorVal::Assign(unsigned int index, ValPtr element) {
 
     if ( yield_types ) {
         const auto& t = element->GetType();
-        (*yield_types)[index] = t;
+        auto& yt_i = (*yield_types)[index];
         auto& elem = vector_val[index];
         if ( elem )
-            ZVal::DeleteIfManaged(*elem, t);
+            ZVal::DeleteIfManaged(*elem, yt_i);
+        yt_i = t;
         elem = ZVal(std::move(element), t);
     }
     else {
diff --git a/src/script_opt/Expr.cc b/src/script_opt/Expr.cc
index 1ad24c5277..8516224106 100644
--- a/src/script_opt/Expr.cc
+++ b/src/script_opt/Expr.cc
@@ -1629,6 +1629,9 @@ ExprPtr AssignExpr::Reduce(Reducer* c, StmtPtr& red_stmt) {
         StmtPtr lhs_stmt;
         StmtPtr rhs_stmt;
 
+        if ( GetType()->Tag() == TYPE_ANY && op2->GetType()->Tag() != TYPE_ANY )
+            op2 = with_location_of(make_intrusive<CoerceToAnyExpr>(op2), op2);
+
         auto lhs_e = field_e->Op()->Reduce(c, lhs_stmt);
         auto rhs_e = op2->ReduceToFieldAssignment(c, rhs_stmt);
 
diff --git a/src/script_opt/ZAM/OPs/ZAM.op b/src/script_opt/ZAM/OPs/ZAM.op
index 36f8beddd9..bd78716459 100644
--- a/src/script_opt/ZAM/OPs/ZAM.op
+++ b/src/script_opt/ZAM/OPs/ZAM.op
@@ -934,13 +934,13 @@ eval	auto& vsel = frame[z.v2].vector_val->RawVec();
 	auto& v1 = frame[z.v3].vector_val->RawVec();
 	auto& v2 = frame[z.v4].vector_val->RawVec();
 	auto n = v1.size();
-	auto res = new vector<std::optional<ZVal>>(n);
+	vector<std::optional<ZVal>> res(n);
 	for ( auto i = 0U; i < n; ++i )
 		if ( vsel[i] )
-			(*res)[i] = vsel[i]->int_val ? v1[i] : v2[i];
+			res[i] = vsel[i]->int_val ? v1[i] : v2[i];
 	auto& full_res = frame[z.v1].vector_val;
 	Unref(full_res);
-	full_res = new VectorVal(cast_intrusive<VectorType>(z.t), res);
+	full_res = new VectorVal(cast_intrusive<VectorType>(z.t), &res);
 
 # Our instruction format doesn't accommodate two constants, so for
 # the singular case of a V ? C1 : C2 conditional, we split it into
@@ -1254,9 +1254,14 @@ macro	AssignFromRec()
 	for ( size_t i = 0U; i < n; ++i )
 		{
 		auto rhs_i = rhs->RawField(rhs_map[i]);
+		auto& init_i = init_vals[lhs_map[i]];
 		if ( is_managed[i] )
+			{
 			zeek::Ref(rhs_i.ManagedVal());
-		init_vals[lhs_map[i]] = rhs_i;
+			if ( init_i )
+				ZVal::DeleteManagedType(*init_i);
+			}
+		init_i = rhs_i;
 		}
 
 op Construct-Known-Record-From
@@ -1606,7 +1611,19 @@ op Any-Vector-Elem-Assign
 op1-read
 set-type $1
 type VVV
-eval	EvalVectorElemAssign(, vv->Assign(ind, frame[z.v3].ToVal(z.t)))
+eval	auto ind = frame[z.v2].AsCount();
+	auto vv = frame[z.v1].AsVector();
+	auto yt = vv->RawYieldTypes();
+	if ( ind < vv->Size() && yt && (*yt)[ind] && ZVal::IsManagedType((*yt)[ind]) )
+		{
+		auto orig_elem = vv->RawVec()[ind];
+		if ( ! vv->Assign(ind, frame[z.v3].ToVal(z.t)) )
+			ZAM_run_time_error(z.loc, "value used but not set");
+		if ( orig_elem )
+			ZVal::DeleteManagedType(*orig_elem);
+		}
+	else if ( ! vv->Assign(ind, frame[z.v3].ToVal(z.t)) )
+		ZAM_run_time_error(z.loc, "value used but not set");
 
 op Vector-Elem-Assign-Any
 op1-read
diff --git a/src/script_opt/ZAM/ZBody.cc b/src/script_opt/ZAM/ZBody.cc
index 0eb283284a..77bb11b93b 100644
--- a/src/script_opt/ZAM/ZBody.cc
+++ b/src/script_opt/ZAM/ZBody.cc
@@ -214,8 +214,9 @@ static void vec_exec(ZOp op, TypePtr t, VectorVal*& v1, const VectorVal* v2, con
                     std::string err = "overflow promoting from ";                                                      \
                     err += ov_err;                                                                                     \
                     err += " arithmetic value";                                                                        \
+                    /* The run-time error will throw an exception, so recover intermediary memory. */                  \
+                    delete res_zv;                                                                                     \
                     ZAM_run_time_error(z.loc, err.c_str());                                                            \
-                    res[i] = std::nullopt;                                                                             \
                 }                                                                                                      \
                 else                                                                                                   \
                     res[i] = ZVal(cast(vi));                                                                           \
@@ -604,8 +605,7 @@ static void vec_exec(ZOp op, TypePtr t, VectorVal*& v1, const VectorVal* v2, con
 
     auto& vec2 = v2->RawVec();
     auto n = vec2.size();
-    auto vec1_ptr = new vector<std::optional<ZVal>>(n);
-    auto& vec1 = *vec1_ptr;
+    vector<std::optional<ZVal>> vec1(n);
 
     for ( auto i = 0U; i < n; ++i ) {
         if ( vec2[i] )
@@ -620,7 +620,7 @@ static void vec_exec(ZOp op, TypePtr t, VectorVal*& v1, const VectorVal* v2, con
 
     auto vt = cast_intrusive<VectorType>(std::move(t));
     auto old_v1 = v1;
-    v1 = new VectorVal(std::move(vt), vec1_ptr);
+    v1 = new VectorVal(std::move(vt), &vec1);
     Unref(old_v1);
 }
 
@@ -631,8 +631,13 @@ static void vec_exec(ZOp op, TypePtr t, VectorVal*& v1, const VectorVal* v2, con
     auto& vec2 = v2->RawVec();
     auto& vec3 = v3->RawVec();
     auto n = vec2.size();
-    auto vec1_ptr = new vector<std::optional<ZVal>>(n);
-    auto& vec1 = *vec1_ptr;
+
+    if ( vec3.size() != n ) {
+        ZAM_run_time_error(util::fmt("vector operands are of different sizes (%d vs. %d)", int(n), int(vec3.size())));
+        return;
+    }
+
+    vector<std::optional<ZVal>> vec1(n);
 
     for ( auto i = 0U; i < vec2.size(); ++i ) {
         if ( vec2[i] && vec3[i] )
@@ -647,7 +652,7 @@ static void vec_exec(ZOp op, TypePtr t, VectorVal*& v1, const VectorVal* v2, con
 
     auto vt = cast_intrusive<VectorType>(std::move(t));
     auto old_v1 = v1;
-    v1 = new VectorVal(std::move(vt), vec1_ptr);
+    v1 = new VectorVal(std::move(vt), &vec1);
     Unref(old_v1);
 }