WebformHelpManager does a lot of stuff directly in __construct() (in methods called from __construct(). This is discouraged for services, as they might be initialized as dependencies to something without actually being used.
For example, this service is injected into a drush command, which are discovered very early.
Specifically, this is causing an error for us when doing a cache clear or updb going from from Drupal 10 to 11: "Route "webform.addons" does not exist.". A similar issue was also reported in #3465838-19: Drupal 11 compatibility fixes for webform → .
Do the init when the information is requested.
Active
6.3
Code
Looks good to me at first glance, didn't test yet, but will when I get back to D11 preparations for us.