add known issue about bls (#366)

* add known issue about bls

* Change bullets to headings

Author: lsgunnlsgunn

modules/release-notes/pages/0.6.26-rn.adoc

@@ -45,8 +45,16 @@ This release updates the default cycles wallet to provide better handling of unu
 
 This section covers any known issues or limitations that might affect how you work with the {sdk-short-name} in specific environments or scenarios.
 
+=== Only the default wallet canister principal can perform canister management tasks
+
 The introduction of the cycles wallet canister changes the default principal used to perform key canister management tasks, such as registering a new canister identifier and deploying a new canister on the {IC}.
 This change introduces some inconsistencies in the identity used to perform certain tasks and can result in potential access control issues.
 
 You should note that none of the tutorials have been updated to reflect this specific change in behavior yet and the current version of the link:../developers-guide/tutorials/access-control{outfilesuffix}[Add access control with identities] tutorial is known to be invalid for this release.
-If you want to experiment with access control using the link:../developers-guide/tutorials/access-control{outfilesuffix}[Add access control with identities] tutorial, you should install the {sdk-short-name} version 0.6.23 (or older). 
+If you want to experiment with access control using the link:../developers-guide/tutorials/access-control{outfilesuffix}[Add access control with identities] tutorial, you should install the {sdk-short-name} version 0.6.23 (or older).
+
+=== Incompatibility when using the JavaScript agent directly in a project
+
+If you access the `@dfinity/agent` JavaScript agent directly in a project—that is, without going through the bootstrap server—you will not be able to import the `bls` certification scheme with the `agent-js` release. 
+
+If your application uses the JavaScript agent directly, you should use the latest beta version (`@dfinity/agent@0.6.26-beta.1`) of the agent instead of the published version.