Hi @martink15467522,
Thank you for reaching out with your questions. Regarding the LTS version, Adobe designates one LTS version each year, typically around November. This version continues to receive security updates and assisted support for up to one year, until it is replaced by the next LTS version. You can find more details in the official support policy here:
https://adobe.ly/4vC14NM
For release notes, LTS versions are included within the same Illustrator release notes page as other versions. There isn’t a separate page for LTS, but you can find the relevant updates and fixes under the respective version sections. Ref: Adobe Illustrator on desktop release notes
To report any bugs in the LTS version, you can create a report on the Illustrator UserVoice page and also share it on the Illustrator Community here so it can be tracked and reviewed by us and the product team.
Please feel free to reach out if you have any further questions.
Abhishek