Tokens containing HTML in notification emails show HTML tags in emails

The patch #9 solved the problem here.

The patch in #9 partially solved my issue. However I'm now running across the following behavior:
Config:
registration_notification:
enabled: true
subject: "You've Successfully Registered"
body: "Your registration for [eventseries:title] was successful.\r\n\r\n[eventseries:field_revent_confirmation_text]"

registration_reminder:
enabled: true
subject: 'Upcoming Event Reminder'
body: '[eventseries:reminder_message]'

Patch from #9 applied.

Behavior:
Tokens are correctly replaced for both emails.

Registration reminders are sent correctly as full html.

Registration notifications have their HTML stripped.

Any help would be greatly appreciated.

After some weekend work I still couldn't figure out why the token replacement would break on reminder vs. registration. If I used replacePlain() it would work for one but not the other, and if I used replace() it would work for the reverse. Then I realized I had different token names in place for each, so I just modified the patch for a customized if statement, looking at the name of the token and performing the appropriate replace function, e.g.:

diff --git a/modules/recurring_events_registration/src/NotificationService.php b/modules/recurring_events_registration/src/NotificationService.php
index ac30381..64798fc 100644
--- a/modules/recurring_events_registration/src/NotificationService.php
+++ b/modules/recurring_events_registration/src/NotificationService.php
@@ -431,7 +431,15 @@ class NotificationService {
     ];
     // Double token replace to allow for global token replacements containing
     // tokens themselves.
-    return $this->token->replace($this->token->replace($string, $data), $data);
+    // Check to see if the string contains 'reminder_message'. If so, use replacePlain.
+    // if not, use double replace as before.
+    // This is to avoid HTML entity encoding of the reminder message.
+    if (strpos($string, '[eventseries:reminder_message]') === false) {
+      return $this->token->replace($this->token->replace($string, $data), $data);
+    }
+    // Use replacePlain for non-HTML strings to avoid HTML entity encoding.
+    $tokenized_data = $this->token->replacePlain($string, $data);
+    return $this->token->replace($tokenized_data, $data);
   }

   /**