Hello.
We plan to deprecate and remove Legacy Libraries, a.k.a. Content Libraries V1.
Please read [DEPR]: Legacy Content Libraries (V1) for more information and to post any questions or comments. The proposed deadline for comments before acceptance is Friday, February 27, 2026. Once the ticket is accepted, removal won’t happen until Friday, May 1, 2026.
(…yes, we have announced the deprecation of Legacy Libraries once or twice before. The migration path to the new environment wasn’t up to our standards, though, so we had to delay. This time we mean it, though! 
)
After acceptance, all future notifications around removal will only be posted to the GitHub issue, so be sure to watch that issue if you want further updates.
Thank you!