[BUG] Unable to get document correct URI with Intent.ACTION_CREATE_DOCUMENT and FLAG_GRANT_PERSISTABLE_URI_PERMISSION

Actual behaviour

I am trying to use SAF to save a file directly in owncloud and the idea is to keep the URI returned so that I can eventually overwrite it.
currently the code is

            Intent fileSelector = new Intent(Intent.ACTION_CREATE_DOCUMENT);
            fileSelector.addCategory(Intent.CATEGORY_OPENABLE);
            fileSelector.setType("text/*");
            fileSelector.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
                                  Intent.FLAG_GRANT_READ_URI_PERMISSION |
                                  Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);
            fileSelector.putExtra(Intent.EXTRA_TITLE, "bookmarks.html");

upon receipt of the intent:

public void onIntentCompleted(WindowAndroid window, int resultCode, Intent data) {
            if (data == null) return;
            Uri filePath = data.getData();
            ContentResolver resolver = ContextUtils.getApplicationContext().getContentResolver();
            resolver.takePersistableUriPermission(filePath, Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
                                                                        Intent.FLAG_GRANT_READ_URI_PERMISSION);
...

I receive as a filePath = content://org.owncloud.documents/document/-1. reselecting the same generated document instead returns a correct id

Expected behaviour

receive a value like content://org.owncloud.documents/document/<IDDOCUMENT>

Can this problem be reproduced with the official owncloud server?
yes, actually I have content://org.owncloud.documents/document/-1

Environment data

Android version: A9

Device model: BLN-L22

Stock or customized system:
Customized: Omni Rom

ownCloud app version:
version 2.16 release 0259f7bef

ownCloud server version:
ownCloud 10.4.1 (stable)

Thanks for your help

Start by reproducing the flow using Intent.ACTION_CREATE_DOCUMENT and the onIntentCompleted handler, then inspect the URI returned by ContentResolver.takePersistableUriPermission. Compare the initial URI with the URI returned after reselecting the document and verify that the created document receives its actual ID instead of -1.