Hi, this was an intentional change made in the most recent version of realm-core. Please see here: Release Realm Core v13.26.0 · realm/realm-core · GitHub
This field actually had no use in a synced realm. We are planning on releasing a feature soon that will introduce the concept of schema versions for synced realms and we will begin using that to correlate the schemaVersion in the realm with the schemaVersion in the cloud.
Best,
Tyler