Studio by Spotify Labs cannot write to library: client connection failed on macOS

[RhymezWitBanana]

Plan
Premium

Country
Not specified

Device
Mac running the Spotify desktop client and Studio by Spotify Labs (research preview)

Issue
Studio can read my Spotify library, confirm my account is authenticated, and see active playback. However, every attempt to change the library fails with: client connection failed.

Affected operation
Removing a playlist from Your Library. The same error occurs with both a single test removal and a prepared JSON cleanup batch. No playlist changes were completed.

Steps already tried
1. Fully quit and reopened Spotify.
2. Logged out of Spotify and signed back in.
3. Confirmed the Premium account is authenticated.
4. Started active playback and waited for the new login session to settle.
5. Fully quit and reopened Studio after the fresh Spotify login.
6. Reloaded Studio.
7. Retried a single minimal library write.

Actual result
Read and status operations work, but every write returns client connection failed. Studio has also intermittently reopened with a blank window.

Expected result
Studio should be able to perform the confirmed library changes after authentication.

Please investigate whether Studio's macOS write connection/socket can become stale or desynchronized from its read connection.