I'm not sure exactly where to post this but I'm sure someone will correct me if necessary 🙂
I'm not sure if it's been reported here previously (doesn't seem to be) but the Timeline Storyteller custom visual for Power BI appears to have broken with a recent PBI update.. there is a growing list of complaint feedback on the MS AppSource page (link below), but it appears the developer (which says it's Microsoft) hasn't acknowledged this so far? The negative reviews seems to begin around the end of last month (July 2020).
Typical Microsoft. Every release breaks something else and they do not pay atention to these posts. The only way we have been able to get something like this resolved in the past is to open a ticket with support