Bug in the calculation of composite data sources

Hello,

I have the problem on a new page of my Looker Studio that all calculated fields of my composite data source are displayed as errors.
Unfortunately, I cannot find any errors and believe that this is a bug.
I have already tried to relink the data source, recreate the composite data source and update the fields. Nothing has helped.
Does anyone have any ideas or have they ever been able to solve the problem?

Thank you!