Just not syncing across device

### Which version of floccus are you using?

5.10.3, Edge

### How many bookmarks do you have, roughly?

250

### Are you using other means to sync bookmarks in parallel to floccus?

NO.

### Sync method

WebDAV

### Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

Edge

### Which version of Nextcloud Bookmarks are you using? (if relevant)

N/A

### Which version of Nextcloud? (if relevant)

N/A

### What kind of WebDAV server are you using? (if relevant)

Synology server. Https webdav. Separate ID/PW just for floccus

### Describe the Bug

Have use Floccus for a while across browsers and iphone. Couple of issues:

1. Often I have to go reset everything and do pull downs because of the 20% failsafe limits -- but -- I KNOW that there is not that much change, so it really doesn't work that well.

2. Is just not syncing anymore between my main browser (PC, Edge) and my iphone (Floccus app). I have tried pushes from the browser to the server, reentering passwords, pull downs from the server to the iphone, deleted the app and re-installed, etc. It was close, but going into subfolders there were inconsidtencies in the links -- enough so that it's not a true sync. Top level seems okay, but folder links were not synced.

### Expected Behavior

Should sync.

### To Reproduce

Unsure how to answer. It just stopped workng the way it should. Not sure why.

### Debug log provided

- [ ] I have provided a debug log file

No source file, test, reproducible steps, or debug log is provided. Start by reproducing the Edge-to-iPhone WebDAV sync failure with floccus 5.10.3 and collect a debug log; done means bookmark links in nested folders sync consistently in both directions.

Written by the indexing model from the issue text.