What is the transition? Does it come with an installer? If so, has that transition been updated to support Premiere 2023? It's likely that nothing needs to change, but if there is an installer, it would need to add support for that version. Alternatively, you can try placing the .prm file in C:\Program Files\Adobe\Common\Plug-ins\7.0\MediaCore, which is a common folder that all version of Premiere look at.
Sorry Guys, I described it wrong. The situation is I had imported the transitions preset created by a third party in my PR but it hasn't shown when I open PR every time. I need to import all the presets in PR whenever I want to edit my video. How can I fix it?
Ah, ok. I see the same thing in the public beta, which is also Premiere 2023, and confirmed the expected behavior works in 2022. I'll move this post to the Bugs section and update the title of your post to reflect the issue better.