Hi there,
We plan to deprecate and remove the shared LMS and Studio session cookie, changing Studio to be an OAuth client of the LMS just like other IDAs (in accordance with OEP-42).
Please read https://openedx.atlassian.net/browse/DEPR-166 for more information and to post any questions/comments. The proposed deadline for comments before acceptance is 2021-09-24.
Once the ticket is accepted, removal can happen at any time.
Thanks,
Tim McCormack