This a small fix for a – sadly critical – bug that slipped through the 8.0.0 release. I recommend updating immediately.
An overview of all the changes can be found in our tracker.
You can get the bits from NuGet FirebirdSql.Data.FirebirdClient, EntityFramework.Firebird and FirebirdSql.EntityFrameworkCore.Firebird (or from firebirdsql.org).