Add known issue for version downgrade and re-registration (#32904)

Updated known issues section to include a connection issue after version downgrade and re-registration.

Author: csujedihy

src/content/warp-releases/windows/ga/2026.7.1343.0.yaml

@@ -17,7 +17,7 @@ releaseNotes: |-
   - Fixed empty black window after transitioning from docked dual displays to undocked/internal display.
 
   **Known issues**
-  - None
+  - If a user upgrades to version 2026.7.1343.0, downgrades to an earlier version, re-registers, and then upgrades back to 2026.7.1343.0, the client might fail to connect or switch organizations. To resolve this issue, run `warp-cli registration delete` or `warp-cli registration delete-all`.
 
   For Zero Trust documentation please see: https://developers.cloudflare.com/cloudflare-one/team-and-resources/devices/cloudflare-one-client/  
   For Consumer documentation please see: https://developers.cloudflare.com/warp-client/