There may be compatibility issues with Rails 7.2 due to recent changes introduced in this version.

Consider downgrading to Ruby 2.7 and Rails versions which are supported by the standard environment.

Rails 7.2 now requires Ruby 3.1 as the minimum version. This change means that Rails 7.2 may not be fully compatible with Ruby 3.0 or earlier versions. However, it doesn't explicitly state that Rails 7.2 is incompatible with Ruby 3.2.

Although Ruby 3.2 is supported according to the Runtime Schedule by the App Engine Standard Environment, there have been reports of deployment issues when using it. One example is in the Google Cloud Community mentions problems with the foreman gem when deploying Rails apps with Ruby 3.2 in the Standard Environment.