[SOLR] JSONP callback wrapper not working on Solr 9.3.1

[Chris Stewart]

Hi Solr community

I have been working on migrating from Solr 7.3.1 to Solr 9.3.0 and have hit an 
issue where my JSONP callback request isn't being handled correctly.   When I 
request the callback function with wt=json, I am just getting normal JSON back. 
  Specifying wt=python does wrap the return correctly, but the output is 
unsuitable for my framework

My test cases are:

wt=json&json.wrf=ng_jsonp_callback_0 on Solr 9.3.0

{   "responseHeader":{     "status":0,     "QTime":9,     "params":{

wt=python&json.wrf=ng_jsonp_callback_0 on Solr 9.3.0

ng_jsonp_callback_0({   'responseHeader':{     'status':0,     'QTime':28,

wt=json&json.wrf=ng_jsonp_callback_0 on Solr 7.3.1

ng_jsonp_callback_0({   "responseHeader":{     "status":400,     "QTime":206,   
  "params":{


Am I missing some config?   I've checked over the release notes and 
documentation and can't see anything obviously different between my 2 versions 
to explain this?


Many thanks in advance

Chris