Steps to reproduce the issue

Add a module in an article using Add module button from the editor.
After choosing the module, we get in the editor's window:

{loadmoduleid 109}

Expected result

Module with ID 109 should be displayed in the content of the article on the preview page after saving the article.

Actual result

Error page with: Call to undefined method JModuleHelper::getModuleById()

System information (as much as possible)

Joomla 3.9.10

PHP 7.2 (ea-php72)

alt-svc | quic=":443"; ma=2592000; v="35,39,43"
cache-control | no-store, no-cache, must-revalidate, post-check=0, pre-check=0
connection | close
content-encoding | gzip
content-type | text/html; charset=utf-8
date | Wed, 24 Jul 2019 16:57:05 GMT
expires | Wed, 17 Aug 2005 00:00:00 GMT
last-modified | Wed, 24 Jul 2019 16:57:05 GMT
pragma | no-cache
server | LiteSpeed
transfer-encoding | chunked
vary | Accept-Encoding
Time to contact web server | 2.879497 seconds

Additional comments

If I manually edit the syntax to {loadmodule mod_login,module title} the result is as expected. Please modify back the plugin file loadmodule to use the old syntax by module type and name, not by ID, and also add a warning not to change the module name, otherwise the already inserted module name in old articles will not be updated to the new module name.

Thank you