thanks for your answer.
I changed my environment to the testing channel and got version
2.4.0-S1452-1
cleared the cache but still the same issue.
I had a look here
They wrote Get 2.4.0 Milestone 6 from here: [JFrog.io](https://openhab.jfrog.io/openhab/libs-milestone-local/org/openhab/distro/openhab/2.4.0.M6/) (or the testing repo)