diff --git a/bio2zarr/icf.py b/bio2zarr/icf.py
index 887b8533..9b7a2c1d 100644
--- a/bio2zarr/icf.py
+++ b/bio2zarr/icf.py
@@ -79,6 +79,14 @@ def full_name(self):
             return self.name
         return f"{self.category}/{self.name}"
 
+    @property
+    def max_number(self):
+        if self.vcf_number in ("R", "A", "G", "."):
+            return self.summary.max_number
+        else:
+            # use declared number if larger than max found
+            return max(self.summary.max_number, int(self.vcf_number))
+
     def smallest_dtype(self):
         """
         Returns the smallest dtype suitable for this field based
diff --git a/bio2zarr/vcz.py b/bio2zarr/vcz.py
index 94022327..8d262c0c 100644
--- a/bio2zarr/vcz.py
+++ b/bio2zarr/vcz.py
@@ -136,10 +136,14 @@ def from_field(
             dimensions.append("samples")
         if array_name is None:
             array_name = prefix + vcf_field.name
+
         # TODO make an option to add in the empty extra dimension
-        if vcf_field.summary.max_number > 1 or vcf_field.full_name == "FORMAT/LAA":
-            shape.append(vcf_field.summary.max_number)
-            chunks.append(vcf_field.summary.max_number)
+        max_number = vcf_field.max_number
+        if (max_number > 0 and vcf_field.vcf_number in ("R", "A", "G")) or (
+            max_number > 1 or vcf_field.full_name == "FORMAT/LAA"
+        ):
+            shape.append(max_number)
+            chunks.append(max_number)
             # TODO we should really be checking this to see if the named dimensions
             # are actually correct.
             if vcf_field.vcf_number == "R":
diff --git a/tests/data/vcf/chr22.vcf.gz b/tests/data/vcf/chr22.vcf.gz
new file mode 100644
index 00000000..0bd64cba
Binary files /dev/null and b/tests/data/vcf/chr22.vcf.gz differ
diff --git a/tests/data/vcf/chr22.vcf.gz.csi b/tests/data/vcf/chr22.vcf.gz.csi
new file mode 100644
index 00000000..930ed67a
Binary files /dev/null and b/tests/data/vcf/chr22.vcf.gz.csi differ
diff --git a/tests/test_core.py b/tests/test_core.py
index 2f4aa838..03f380f5 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -237,8 +237,8 @@ def test_examples(self, chunk_size, size, start, stop):
         # It works in CI on Linux, but it'll probably break at some point.
         # It's also necessary to update these numbers each time a new data
         # file gets added
-        ("tests/data", 4983044),
-        ("tests/data/vcf", 4970907),
+        ("tests/data", 5030777),
+        ("tests/data/vcf", 5018640),
         ("tests/data/vcf/sample.vcf.gz", 1089),
     ],
 )
diff --git a/tests/test_vcf_examples.py b/tests/test_vcf_examples.py
index fa333f36..193dfa2a 100644
--- a/tests/test_vcf_examples.py
+++ b/tests/test_vcf_examples.py
@@ -563,6 +563,21 @@ def test_gts(self, ds):
         assert "call_genotype" not in ds
 
 
+class TestChr22Example:
+    data_path = "tests/data/vcf/chr22.vcf.gz"
+
+    @pytest.fixture(scope="class")
+    def ds(self, tmp_path_factory):
+        out = tmp_path_factory.mktemp("data") / "example.vcf.zarr"
+        icf.convert([self.data_path], out, worker_processes=0)
+        return sg.load_dataset(out)
+
+    def test_call_SB(self, ds):
+        # fixes https://github.com/sgkit-dev/bio2zarr/issues/355
+        assert ds.call_SB.dims == ("variants", "samples", "FORMAT_SB_dim")
+        assert ds.call_SB.shape == (100, 100, 4)
+
+
 class Test1000G2020Example:
     data_path = "tests/data/vcf/1kg_2020_chrM.vcf.gz"
 
@@ -997,6 +1012,11 @@ def test_variant_ANN(self, ds):
         ]
         nt.assert_array_equal(ds.variant_ANN.values, variant_ANN)
 
+    def test_variant_MLEAF(self, ds):
+        # fixes https://github.com/sgkit-dev/bio2zarr/issues/353
+        assert ds.variant_MLEAF.dims == ("variants", "alt_alleles")
+        assert ds.variant_MLEAF.shape == (21, 1)
+
 
 class TestGeneratedFieldsExample:
     data_path = "tests/data/vcf/field_type_combos.vcf.gz"