@PersistedName(name="Grower")
class RlmGrower(): RealmObject {
    @PrimaryKey
    var _id: String = RealmUUID.random().toString()
    val farms: RealmResults<RlmFarm> by backlinks(RlmFarm::grower)
// ...
}

@PersistedName(name="Farm")
class RlmFarm(): RealmObject {
    @PrimaryKey
    var _id: String = RealmUUID.random().toString()
    @PersistedName(name="growerId")
    var grower: RlmGrower? = null
// ...

config = SyncConfiguration.Builder(currentUser, setOf(RlmGrower::class, RlmFarm::class))
            .initialSubscriptions { realm ->
                add(getQuery<RlmGrower>(realm), "Grower Subscription")
                add(getQuery<RlmFarm>(realm), "Farm Subscription")
            }

Function doesn't have or inherit @Throws annotation and thus exception isn't propagated from Kotlin to Objective-C/Swift as NSError.
It is considered unexpected and unhandled instead. Program will be terminated.
Uncaught Kotlin exception: kotlin.IllegalStateException: [RLM_ERR_SCHEMA_VALIDATION_FAILED]: Schema validation failed due to the following errors:
- Property 'Farm.growerId' of type 'object' has unknown object type 'RlmGrower'
- Property 'Farm.growerId' declared as origin of linking objects property 'Grower.farms' links to type 'RlmGrower'
    at 0   TractionMPShared                    0x106e04127        kfun:kotlin.Throwable#<init>(kotlin.String?){} + 123 
    at 1   TractionMPShared                    0x106dfc4a7        kfun:kotlin.Exception#<init>(kotlin.String?){} + 119 
    at 2   TractionMPShared                    0x106dfc8eb        kfun:kotlin.RuntimeException#<init>(kotlin.String?){} + 119 
    at 3   TractionMPShared                    0x106dfcf5f        kfun:kotlin.IllegalStateException#<init>(kotlin.String?){} + 119 
    at 4   TractionMPShared                    0x1070ee503        kfun:io.realm.kotlin.internal.interop.CoreErrorConverter#asThrowable(kotlin.Int;kotlin.Int;kotlin.String?;kotlin.String?;kotlin.Throwable?){}kotlin.Throwable + 1559 
    at 5   TractionMPShared                    0x107170c47        kfun:io.realm.kotlin.internal.interop.throwOnError#internal + 1195 
    at 6   TractionMPShared                    0x10716f4cf        kfun:io.realm.kotlin.internal.interop.checkedPointerResult#internal + 131 
    at 7   TractionMPShared                    0x10716e9c3        kfun:io.realm.kotlin.internal.interop.CPointerWrapper#<init>(kotlinx.cinterop.CPointer<out|kotlinx.cinterop.CPointed>?;kotlin.Boolean){} + 251 
    at 8   TractionMPShared                    0x10716eb97        kfun:io.realm.kotlin.internal.interop.CPointerWrapper#<init>(kotlinx.cinterop.CPointer<out|kotlinx.cinterop.CPointed>?;kotlin.Boolean;kotlin.Int;kotlin.native.internal.DefaultConstructorMarker?){} + 203 
    at 9   TractionMPShared                    0x10711a337        kfun:io.realm.kotlin.internal.interop.RealmInterop#realm_open(io.realm.kotlin.internal.interop.NativePointer<io.realm.kotlin.internal.interop.RealmConfigT>;kotlinx.coroutines.CoroutineDispatcher?){}kotlin.Pair<io.realm.kotlin.internal.interop.NativePointer<io.realm.kotlin.internal.interop.LiveRealmT>,kotlin.Boolean> + 1451 
    at 10  TractionMPShared                    0x10711a763        kfun:io.realm.kotlin.internal.interop.RealmInterop#realm_open$default(io.realm.kotlin.internal.interop.NativePointer<io.realm.kotlin.internal.interop.RealmConfigT>;kotlinx.coroutines.CoroutineDispatcher?;kotlin.Int){}kotlin.Pair<io.realm.kotlin.internal.interop.NativePointer<io.realm.kotlin.internal.interop.LiveRealmT>,kotlin.Boolean> + 275 
    at 11  TractionMPShared                    0x1071a128f        kfun:io.realm.kotlin.internal.ConfigurationImpl#openRealm(io.realm.kotlin.internal.RealmImpl){}kotlin.Pair<io.realm.kotlin.internal.FrozenRealmReference,kotlin.Boolean> + 463 
    at 12  TractionMPShared                    0x1073f16b7        kfun:io.realm.kotlin.mongodb.internal.SyncConfigurationImpl.$openRealmCOROUTINE$34#invokeSuspend(kotlin.Result<kotlin.Any?>){}kotlin.Any? + 2623 
    at 13  TractionMPShared                    0x1073f198b        kfun:io.realm.kotlin.mongodb.internal.SyncConfigurationImpl#openRealm(io.realm.kotlin.internal.RealmImpl){}kotlin.Pair<io.realm.kotlin.internal.FrozenRealmReference,kotlin.Boolean> + 291 
    at 14  TractionMPShared                    0x1071cb1cb        kfun:io.realm.kotlin.internal.RealmImpl.$<init>$lambda$0COROUTINE$203.invokeSuspend#internal + 727 
    at 15  TractionMPShared                    0x106e0866b        kfun:kotlin.coroutines.native.internal.BaseContinuationImpl#resumeWith(kotlin.Result<kotlin.Any?>){} + 599 
    at 16  TractionMPShared                    0x1070bc1b3        kfun:kotlinx.coroutines.DispatchedTask#run(){} + 2831 
    at 17  TractionMPShared                    0x10704ec4f        kfun:kotlinx.coroutines.EventLoopImplBase#processNextEvent(){}kotlin.Long + 1279 
    at 18  TractionMPShared                    0x1070e186b        kfun:kotlinx.coroutines.BlockingCoroutine.joinBlocking#internal + 467 
    at 19  TractionMPShared                    0x1070e1143        kfun:kotlinx.coroutines#runBlocking(kotlin.coroutines.CoroutineContext;kotlin.coroutines.SuspendFunction1<kotlinx.coroutines.CoroutineScope,0:0>){0§<kotlin.Any?>}0:0 + 1719 
    at 20  TractionMPShared                    0x1072684cf        kfun:io.realm.kotlin.internal.platform#runBlocking(kotlin.coroutines.CoroutineContext;kotlin.coroutines.SuspendFunction1<kotlinx.coroutines.CoroutineScope,0:0>){0§<kotlin.Any?>}0:0 + 127 
    at 21  TractionMPShared                    0x107268657        kfun:io.realm.kotlin.internal.platform#runBlocking$default(kotlin.coroutines.CoroutineContext?;kotlin.coroutines.SuspendFunction1<kotlinx.coroutines.CoroutineScope,0:0>;kotlin.Int){0§<kotlin.Any?>}0:0 + 339 
    at 22  TractionMPShared                    0x1071c7a67        kfun:io.realm.kotlin.internal.RealmImpl.<init>#internal + 2459 
    at 23  TractionMPShared                    0x1071ca7df        kfun:io.realm.kotlin.internal.RealmImpl.Companion#create(io.realm.kotlin.internal.InternalConfiguration){}io.realm.kotlin.internal.RealmImpl + 139 
    at 24  TractionMPShared                    0x10719609f        kfun:io.realm.kotlin.Realm.Companion#open(io.realm.kotlin.Configuration){}io.realm.kotlin.Realm + 259 
    at 25  TractionMPShared                    0x10744edf7        kfun:com.********ag.********mp.repository.repo.impl.RealmSyncRepository#<init>(io.realm.kotlin.mongodb.User;kotlin.Function2<io.realm.kotlin.mongodb.sync.SyncSession,io.realm.kotlin.mongodb.exceptions.SyncException,kotlin.Unit>){} + 771 
    at 26  TractionMPShared                    0x10744d073        kfun:com.********ag.********mp.repository.factory.impl.RealmRepositoryFactory#syncRepository(){}com.********ag.********mp.repository.repo.SyncRepository? + 351 
    at 27  TractionMPShared                    0x10749fac7        objc2kotlin_virtual_kfun:com.********ag.********mp.repository.factory.RepositoryFactory#syncRepository(){}com.********ag.********mp.repository.repo.SyncRepository? + 223