Dear @adrian_sev ,
I saw that this error was already encountered in this other post and it’s due to a missing back port fix. In the 6.24 release cycle, you should use 6.24/10 to get your application working again. The full list of releases that support this case is updated at Fix forward compatibility with v6-30 by pcanal · Pull Request #12845 · root-project/root · GitHub
Best,
Vincenzo