The macosX64 variant is missing a .klib
https://repo1.maven.org/maven2/org/jetbrains/annotations-macosX64/26.0.1/
I checked out the project and published it to a local directory (using my Mac), and I can see a klib.
Possibly something went wrong when publishing the library to Maven Central. Was the publishing done from an Apple machine?