floccus: Sync failing under 4.4.1, 4.4.2, 4.4.3 now issuing Cannot map parentId errors under v4.4.6

Describe the bug

1. Starting sync on 4.4.4 from toolbar icon click renders a popup window with an endless spinning circle for 10-15s. Eventually, the UI draws itself. (This was never an issue before).
2. Cannot map parentid errors.

To Reproduce Steps to reproduce the behavior:

1. Start a sync after upgrading Floccus to 4.4.4 and Bookmarks to 3.4.6. [edit: Still happening with 4.4.6 and 3.4.9.]

Expected behavior Sync should work, which it was doing prior to 4.4 series.

Screenshots

Desktop (please complete the following information): Windows, Firefox 82.0.2, Floccus 4.4.4, Nextcloud folders,

Server (please complete the following information): Debian Buster, Nextcloud 19.0.4, Bookmarks app 3.4.6

Note: As your debug log usually contains large parts of your bookmark data, instead of attaching it publicly to the issue here, I recommend uploading it privately at the following URL https://klehranlage.net/index.php/s/7nn82NSBsfQKdsJ

• Debug log provided: floccus-4.4.4-2020-10-30-33.log

Additional context

Prior to 4.4.4 update I was getting root folder errors. Those appear to have stopped.