Are Queries Permitted/Valid Inside a Write Transaction?

MongoDB Atlas App Services & Realm Realm
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There are a couple of typo’s in the code .objects(ofType: Parent.self) should be .objects(Parent.self) for example, but other than that it’s works as is. note this : Results<Child> is not needed

In general the only task that must be within a write is when a managed object is modified so this is the only line that does that

parent.hasFlaggedChildren...

Technically you could encapsulate just that line within a write

try! realm.write {
   parent.hasFlaggedChildren
}

But that leads to the next question; do you have any other code attempting to modify those objects after the query (the read?)

Results objects reflect the current state of those objects - if they are modified elsewhere it will be reflected here so that could be a factor.