can't update JSON Schema to AVRO with pulsar-admin

Describe the bug
Changing just the type of schema does not work

To Reproduce
Steps to reproduce the behavior:

1. create a file /tmp/yoshi containing:

{
    "type": "JSON",
    "schema": "{\"type\":\"record\",\"name\":\"User\",\"namespace\":\"com.foo\",\"fields\":[{\"name\":\"file1\",\"type\":[\"null\",\"string\"],\"default\":null},{\"name\":\"file2\",\"type\":\"string\",\"default\":null},{\"name\":\"file3\",\"type\":[\"null\",\"string\"],\"default\":\"dfdf\"}]}",
    "properties": {}
}

2. now type pulsar-admin schemas upload -f /tmp/yoshi persistent://public/default/yoshi to upload the schema
3. now type pulsar-admin schemas get persistent://public/default/yoshi
   the result will say:

...
 "type": "JSON",
...

which is ok
4. edit /tmp/yoshi and change

...
  "type": "AVRO",
...

5. now type pulsar-admin schemas upload -f /tmp/yoshi persistent://public/default/yoshi to upload the schema
6. now type pulsar-admin schemas get persistent://public/default/yoshi
   the result will say:

...
 "type": "JSON",
...

it should say instead 'AVRO'

Desktop (please complete the following information):

• macos, pulsar-all docker image 2.4.0 standalone

[sijie]

@pouledodue I don't think we allow changing the schema type at this moment. In your case, you are changing the schema type from AVRO to JSON

[stupidusername]

Have you tried deleting the schema before changing its type?

$ pulsar-admin schemas delete persistent://public/default/yoshi

And then upload the new schema.

yes it's ok when I delete it before