I am playing with GB self hosting + Ciphered payload [ Script Tag] I included required payload

<script async
  data-api-host="<http://localhost:3300>"
  data-client-key="sdk-9m8LOKhsUcWrizJQ"
  data-decryption-key="SECRET"
  src="<https://cdn.jsdelivr.net/npm/@growthbook/growthbook/dist/bundles/auto.min.js>"
></script>

I can see encrypted data, getting fetched from my proxy server, but flag evaluates to false (it does evaluate to true for SDK client w/o encryption) What can be a reason? It works on node tho, does JS Web does not support encryption?