All Writes Produce DbUpdateConcurrencyException After 1 Occurs

DbUpdateConcurrencyException: The database operation was expected to affect 1 row(s), but actually affected 0 row(s); data may have been modified or deleted since entities were loaded. See http://go.microsoft.com/fwlink/?LinkId=527962 for information on understanding and handling optimistic concurrency exceptions.

var services = new ServiceCollection();

services.AddDbContext<BobEntities>(options => options.UseNpgsql(Environment.GetEnvironmentVariable("DATABASE_URL"), npgsqlOptions => npgsqlOptions.EnableRetryOnFailure(maxRetryCount: 1, maxRetryDelay: TimeSpan.FromSeconds(5), errorCodesToAdd: null)));

Services = services.BuildServiceProvider();

public class WelcomeGroup(BobEntities dbContext) {
...
var server = await dbContext.GetServer(Context.Guild.Id);

if (server.Welcome != welcome)
{
     server.Welcome = welcome;
     await dbContext.UpdateServer(server);
}
...