base_uri can be passed in manually.

willson-chen · web-flow · commit 8456a3430b4e · 2020-08-05T14:29:40.000+08:00
diff --git a/jsonschema/validators.py b/jsonschema/validators.py
@@ -659,7 +659,7 @@ def __init__(
         )
         self.store.update(store)
         self.store[base_uri] = referrer
-        self.store_subschema(referrer)
+        self.store_subschema(referrer, last_url=base_uri)
 
         self._urljoin_cache = urljoin_cache
         self._remote_cache = remote_cache

Original file line number	Diff line number	Diff line change
`@@ -659,7 +659,7 @@ def __init__(`
`659`	`659`	`)`
`660`	`660`	`self.store.update(store)`
`661`	`661`	`self.store[base_uri] = referrer`
`662`		`- self.store_subschema(referrer)`
	`662`	`+ self.store_subschema(referrer, last_url=base_uri)`
`663`	`663`
`664`	`664`	`self._urljoin_cache = urljoin_cache`
`665`	`665`	`self._remote_cache = remote_cache`