I recently added a library.json file to my library and created a release on GitHub, in it, there are more than one keywords but in the library manager, the keywords aren’t showing up.
Yes, this is the answer to your question. A registry uses library.properties for metadata. We have just manually switched it to library.json. The metadata will be updated based on library.json on the new release. You can also personally manage releases using Redirecting... command.
Thanks, I will keep publishing it to the Arduino library repository because I want it to be available for users who don’t use PlatformIO, I’m glad that the next release will use the library.json file.