The lucee 7 administrator says, I can upgrade my mysql extension from 9.5 to 9.6 but the file is missing: https://ext.lucee.org/com.mysql.cj-9.6.0.lex If this is already known, please disregard my post.

You were using an older extension matrix for your custom build, rather than updating to match the release extension matrix, i.e. the versions the MANIFEST.mf specifies, which is the known / supported versions. We can’t retrospectively patch older extensions lucee/Lucee/blob/7.0/core/src/ma…