Softr charts do not work with linked fields in Airtable

Softr charts are not able too any column that’s a linked field in an Airtable table. If I create a copy of that field into a plain text field, charts see that fine.
btw: The table block, the list block and all other blocks can see the linked field, just the chart block is not able to see linked fields.
This feels like a bug

Do we even need linked fields anymore? Looking at this article, it seems like it does it based on pure text value.