diff --git a/CHANGES b/CHANGES
index f76ea2f09e..e3adb31d0d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+6.1.0-dev.331 | 2023-08-25 21:38:40 +0200
+
+  * BTests for any/vector-of-any fixes (Vern Paxson, Corelight)
+
+  * fixes for vector assignments involving "any"/"vector of any" types (Vern Paxson, Corelight)
+
 6.1.0-dev.327 | 2023-08-24 12:17:42 -0700
 
   * updated notes regarding "-O gen-C++" maintenance (Vern Paxson, Corelight)
diff --git a/NEWS b/NEWS
index 36ea56bee9..e9769a31b6 100644
--- a/NEWS
+++ b/NEWS
@@ -61,6 +61,8 @@ New Functionality
 
 - Added new packet analyzer to handle PCAP files DLT_PPP link type.
 
+- Fixed appending of ``any`` to ``vector of any``.
+
 Changed Functionality
 ---------------------
 
diff --git a/VERSION b/VERSION
index 28f4f18589..7b2e46d07d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.1.0-dev.327
+6.1.0-dev.331
diff --git a/src/Expr.cc b/src/Expr.cc
index 6513cacecb..c741e65938 100644
--- a/src/Expr.cc
+++ b/src/Expr.cc
@@ -814,7 +814,8 @@ ValPtr BinaryExpr::Fold(Val* v1, Val* v2) const
 	if ( t1->Tag() == TYPE_VECTOR )
 		{
 		// We only get here when using a matching vector on the RHS.
-		v2->AsVectorVal()->AddTo(v1, false);
+		if ( ! v2->AsVectorVal()->AddTo(v1, false) )
+			Error("incompatible vector element assignment", v2);
 		return {NewRef{}, v1};
 		}
 
@@ -1683,7 +1684,9 @@ AddToExpr::AddToExpr(ExprPtr arg_op1, ExprPtr arg_op2)
 
 	else if ( IsVector(bt1) )
 		{
-		if ( same_type(t1, t2) )
+		// We need the IsVector(bt2) check in the following because
+		// same_type() always treats "any" types as "same".
+		if ( IsVector(bt2) && same_type(t1, t2) )
 			{
 			SetType(t1);
 			return;
diff --git a/src/Val.cc b/src/Val.cc
index f8aa0c6309..cea41553dd 100644
--- a/src/Val.cc
+++ b/src/Val.cc
@@ -3726,7 +3726,8 @@ bool VectorVal::AddTo(Val* val, bool /* is_first_init */) const
 	auto last_idx = v->Size();
 
 	for ( auto i = 0u; i < Size(); ++i )
-		v->Assign(last_idx++, At(i));
+		if ( ! v->Assign(last_idx++, At(i)) )
+			return false;
 
 	return true;
 	}
diff --git a/testing/btest/Baseline/language.vector-any-append/.stderr b/testing/btest/Baseline/language.vector-any-append/.stderr
new file mode 100644
index 0000000000..c58d3b33aa
--- /dev/null
+++ b/testing/btest/Baseline/language.vector-any-append/.stderr
@@ -0,0 +1,2 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+error in <...>/vector-any-append.zeek, line 61: incompatible vector element assignment (v7 += v5 and [a, -3])
diff --git a/testing/btest/Baseline/language.vector-any-append/out b/testing/btest/Baseline/language.vector-any-append/out
index c6c6fd79a1..5c637b1f16 100644
--- a/testing/btest/Baseline/language.vector-any-append/out
+++ b/testing/btest/Baseline/language.vector-any-append/out
@@ -1,2 +1,7 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
 [0, 1, 2, 3]
+[4, 0, 1, 2, 3]
+[1, 2, 3, [4, 5]], 4, count, count, vector of count
+[[r=r], [r=r], [s=s], [s=s]]
+[a, -3]
+[]
diff --git a/testing/btest/language/vector-any-append.zeek b/testing/btest/language/vector-any-append.zeek
index 599859b1d8..c84de88b6d 100644
--- a/testing/btest/language/vector-any-append.zeek
+++ b/testing/btest/language/vector-any-append.zeek
@@ -1,5 +1,6 @@
 # @TEST-EXEC: zeek -b %INPUT >out
 # @TEST-EXEC: btest-diff out
+# @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff .stderr
 
 function assign(v: vector of any)
 	{
@@ -11,6 +12,17 @@ function append(v: vector of any)
 	v += |v|;
 	}
 
+type R: record { r: string &default="r"; };
+type S: record { s: string &default="s"; };
+
+global q: vector of any;
+
+function keep_this_two_ways(r: any)
+	{
+	q += r;
+	q[|q|] = r;
+	}
+
 event zeek_init()
 	{
 	local v: vector of count;
@@ -19,4 +31,35 @@ event zeek_init()
 	append(v);
 	append(v);
 	print v;
+
+	local v2: vector of any;
+	v2 += |v|;
+	v2 += v;
+	print v2;
+
+	local v3: vector of any;
+	local v4: any = vector(4, 5);
+
+	v3 += 1;
+	v3 += vector(2, 3);
+	v3 += v4;
+
+	print v3, |v3|, type_name(v3[0]), type_name(v3[1]), type_name(v3[3]);
+
+	keep_this_two_ways(R());
+	keep_this_two_ways(S());
+	print q;
+
+	local v5: vector of any;
+	local v6: vector of any;
+	local v7: vector of count;
+
+	v5 += "a";
+	v5 += -3;
+
+	v6 += v5;
+	v7 += v5;
+
+	print v6;
+	print v7;
 	}