diff --git a/spacy/tests/serialize/test_serialize_kb.py b/spacy/tests/serialize/test_serialize_kb.py
index 126fb5e51..90fc3136f 100644
--- a/spacy/tests/serialize/test_serialize_kb.py
+++ b/spacy/tests/serialize/test_serialize_kb.py
@@ -86,9 +86,6 @@ def test_serialize_subclassed_kb():
     [nlp]
     lang = "en"
     pipeline = ["entity_linker"]
-    
-    [default_values]
-    custom_field = 666
 
     [components]
 
@@ -96,8 +93,7 @@ def test_serialize_subclassed_kb():
     factory = "entity_linker"
     
     [components.entity_linker.generate_empty_kb]
-    @misc = "spacy.CustomEmptyKB.v1"
-    custom_field = ${default_values.custom_field}
+    @misc = "kb_test.CustomEmptyKB.v1"
     
     [initialize]
 
@@ -106,9 +102,9 @@ def test_serialize_subclassed_kb():
     [initialize.components.entity_linker]
 
     [initialize.components.entity_linker.kb_loader]
-    @misc = "spacy.CustomKB.v1"
+    @misc = "kb_test.CustomKB.v1"
     entity_vector_length = 342
-    custom_field = ${default_values.custom_field}
+    custom_field = 666
     """
 
     class SubInMemoryLookupKB(InMemoryLookupKB):
@@ -116,20 +112,18 @@ def test_serialize_subclassed_kb():
             super().__init__(vocab, entity_vector_length)
             self.custom_field = custom_field
 
-    @registry.misc("spacy.CustomEmptyKB.v1")
-    def empty_custom_kb(
-        custom_field: int,
-    ) -> Callable[[Vocab, int], SubInMemoryLookupKB]:
+    @registry.misc("kb_test.CustomEmptyKB.v1")
+    def empty_custom_kb() -> Callable[[Vocab, int], SubInMemoryLookupKB]:
         def empty_kb_factory(vocab: Vocab, entity_vector_length: int):
             return SubInMemoryLookupKB(
                 vocab=vocab,
                 entity_vector_length=entity_vector_length,
-                custom_field=custom_field,
+                custom_field=0,
             )
 
         return empty_kb_factory
 
-    @registry.misc("spacy.CustomKB.v1")
+    @registry.misc("kb_test.CustomKB.v1")
     def custom_kb(
         entity_vector_length: int, custom_field: int
     ) -> Callable[[Vocab], InMemoryLookupKB]:
diff --git a/website/docs/api/architectures.mdx b/website/docs/api/architectures.mdx
index 966b5830a..268c04a07 100644
--- a/website/docs/api/architectures.mdx
+++ b/website/docs/api/architectures.mdx
@@ -899,15 +899,21 @@ The `EntityLinker` model architecture is a Thinc `Model` with a
 | `nO`        | Output dimension, determined by the length of the vectors encoding each entity in the KB. If the `nO` dimension is not set, the entity linking component will set it when `initialize` is called. ~~Optional[int]~~ |
 | **CREATES** | The model using the architecture. ~~Model[List[Doc], Floats2d]~~                                                                                                                                                    |
 
-### spacy.EmptyKB.v1 {id="EmptyKB"}
+### spacy.EmptyKB.v1 {id="EmptyKB.v1"}
 
 A function that creates an empty `KnowledgeBase` from a [`Vocab`](/api/vocab)
-instance. This is the default when a new entity linker component is created.
+instance.
 
 | Name                   | Description                                                                         |
 | ---------------------- | ----------------------------------------------------------------------------------- |
 | `entity_vector_length` | The length of the vectors encoding each entity in the KB. Defaults to `64`. ~~int~~ |
 
+### spacy.EmptyKB.v2 {id="EmptyKB"}
+
+A function that creates an empty `KnowledgeBase` from a [`Vocab`](/api/vocab)
+instance. This is the default when a new entity linker component is created. It
+returns a `Callable[[Vocab, int], InMemoryLookupKB]`.
+
 ### spacy.KBFromFile.v1 {id="KBFromFile"}
 
 A function that reads an existing `KnowledgeBase` from file.
diff --git a/website/docs/api/entitylinker.mdx b/website/docs/api/entitylinker.mdx
index a7b2ef097..d84dd3ca9 100644
--- a/website/docs/api/entitylinker.mdx
+++ b/website/docs/api/entitylinker.mdx
@@ -64,7 +64,7 @@ architectures and their arguments and hyperparameters.
 | `use_gold_ents`                                     | Whether to copy entities from the gold docs or not. Defaults to `True`. If `False`, entities must be set in the training data or by an annotating component in the pipeline. ~~int~~                                                                                                                             |
 | `get_candidates`                                    | Function that generates plausible candidates for a given `Span` object. Defaults to [CandidateGenerator](/api/architectures#CandidateGenerator), a function looking up exact, case-dependent aliases in the KB. ~~Callable[[KnowledgeBase, Span], Iterable[Candidate]]~~                                         |
 | `get_candidates_batch` <Tag variant="new">3.5</Tag> | Function that generates plausible candidates for a given batch of `Span` objects. Defaults to [CandidateBatchGenerator](/api/architectures#CandidateBatchGenerator), a function looking up exact, case-dependent aliases in the KB. ~~Callable[[KnowledgeBase, Iterable[Span]], Iterable[Iterable[Candidate]]]~~ |
-| `generate_empty_kb` <Tag variant="new">3.6</Tag>    | Function that generates an empty `KnowledgeBase` object. Defaults to generating an empty [`InMemoryLookupKB`](/api/inmemorylookupkb). ~~Callable[[Vocab, int], KnowledgeBase]~~                                                                                                                                  |
+| `generate_empty_kb` <Tag variant="new">3.6</Tag>    | Function that generates an empty `KnowledgeBase` object. Defaults to [`spacy.EmptyKB.v2`](/api/architectures#EmptyKB), which generates an empty [`InMemoryLookupKB`](/api/inmemorylookupkb). ~~Callable[[Vocab, int], KnowledgeBase]~~                                                                           |
 | `overwrite` <Tag variant="new">3.2</Tag>            | Whether existing annotation is overwritten. Defaults to `True`. ~~bool~~                                                                                                                                                                                                                                         |
 | `scorer` <Tag variant="new">3.2</Tag>               | The scoring method. Defaults to [`Scorer.score_links`](/api/scorer#score_links). ~~Optional[Callable]~~                                                                                                                                                                                                          |
 | `threshold` <Tag variant="new">3.4</Tag>            | Confidence threshold for entity predictions. The default of `None` implies that all predictions are accepted, otherwise those with a score beneath the treshold are discarded. If there are no predictions with scores above the threshold, the linked entity is `NIL`. ~~Optional[float]~~                      |