Refresh schedule not available for composite model

Hi all,

I'm encountering a weird issue: I have a report which connects to a shared semantic model as well as to an Azure Synapse SQL endpoint. The semantic model is a direct query connection, while the SQL endpoint uses import mode. This means that a local composite model is created for my report.

I have set the SQL connection to use a service account, and I can refresh my semantic model (the local one, created by the report) manually in the service.

Here's the lineage:

However, I want to schedule a refresh. The option itself is not greyed out, but when I expand it, the content is:

What is even stranger, is that if I add a third source to a local database (needing a gateway), I can schedule a refresh...

When I monitor Azure Synapse, I can see a query from Power BI when I manually refresh from the service.

Any clue is welcome !

Thanks !