index: fix index entries for partial import stages

dvc/output.py

@@ -577,6 +577,8 @@ class Output:
                 if not dep.obj and dep.files:
                     dep.obj = dep.get_obj()
                 entry.obj = dep.obj
+                if not entry.hash_info and dep.obj:
+                    entry.hash_info = dep.obj.hash_info
         return entry
 
     def changed_checksum(self):

dvc/repo/index.py

@@ -466,7 +466,7 @@ class IndexView:
             workspace, key = out.index_key
             if filter_info and out.fs.path.isin(filter_info, out.fs_path):
                 key = key + out.fs.path.relparts(filter_info, out.fs_path)
-            if out.meta.isdir:
+            if out.meta.isdir or out.stage.is_import and out.stage.deps[0].meta.isdir:
                 prefixes[workspace].recursive.add(key)
             prefixes[workspace].explicit.update(key[:i] for i in range(len(key), 0, -1))
         return prefixes