Always read Announcements posts. This happened back in May 2023 (Arch / Manjaro unstable) / July 2023 (Manjaro stable).
That was an Arch repo, not a Manjaro repo. Do not mix repos from different distros.
In 2023 after years of prior work the distribution migrated their back-end services to git and in the same run also switched to a new repository layout. In the new layout extra would contain all packages that were previously in community and the testing repositories were split from testing to core-testing and extra-testing , community-testing was removed entirely.
– Official repositories - ArchWiki
Note that I edited your topic title as it was erroneous and misleading.