Sync breaks when transforming created_at and modified_at fields

[AlexanderBadak]

When using the configuration

configureSyncedSupabase({
	changesSince: 'last-sync',
	fieldCreatedAt: 'created_at',
	fieldUpdatedAt: 'modified_at',
	fieldDeleted: 'deleted',
	updatePartial: true
})

const store$ = observable(
	syncedSupabase({
		supabase,
		collection: 'store',
		filter: select => select.eq('user_id', '1'),
		transform: {
			load(value) {
				return {...value, modifiedAt: value.modified_at}
			},
			save(value) {
				return {...value, modified_at: value.modifiedAt}
			}
		},
		persist: {
			plugin: ObservablePersistLocalStorage,
			name: 'store',
			retrySync: true
		}
	})
)

The plugin tries to POST instead of PATCH the first time you update a value. If I leave the fields untransformed it works just fine.