Hi,
I apologize for the inconvenience.
I have read the details of the problem you sent to my e-mail address.
I think the reason is that the group with the input form and the group with the Realtime Char Counter are different.
Could you please put the Realtime Char Counter icon in the same group as the input form?
Example of how it works
https://bubble.io/page?type=page&name=add_test&id=demo-page-real-time-char-counter&tab=tabs-1
Example of not working
https://bubble.io/page?type=page&name=cannot_count&id=demo-page-real-time-char-counter&tab=tabs-1
If this does not fix it, please contact me again. (plugin author)