KeyVault reference not being resolved at startup, does work when runnning

I'm using KeyVault references in the configuration for my functionapp and it's working fine. But I noticed that during a restart, my application insights is ingested with an exception for all my CosmosFeed functions (where the KeyVault reference is used for the connectionstring), stating: "Error indexing method 'xxxx'" and the innermostMessage "The connection string for the monitored collection is in an invalid format, please use AccountEndpoint".

Using Function App V3, on a Windows Consumption plan.

Is this something I can ignore? The functions work fine anyhow.