Now that 22.04 is released, questions pertaining to it are no longer off-topic (due to the version) as of Thu Apr 21 17:09:48 UTC 2022; however, they may still be closed for other reasons. New 22.04 questions should not be closed for being about 22.04. Of course, posts still need to be on-topic (see the Help Center), just being about 22.04 is no longer a valid reason to close a question.
This does not mean that older (i.e., before release) questions about 22.04 can be reopened without discussion/community consensus. Questions about 22.04 that were published prior to the release remain off-topic unless the community decides on a case-by-case basis that a specific post should be re-opened.