Editing notes created or modified by Desktop Sync Client elsewhere creates "File could not be synced" error

[MillironX]

Previously reported as nextcloud/notes-android#1451
Previously reported as nextcloud/notes#806

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Steps to reproduce

1. Setup the Desktop sync client on one or more computers

2. Create a new note on the Desktop computer

    echo "# Note From Desktop\n\nThe quick brown fox..." >> ~/Nextcloud/Notes/"Note From Desktop.txt"

3. In the Server Notes app, select "Note From Desktop" in the sidebar, and add the text "Does this work?" to the note body

   

4. Wait for the change to be propagated to the Desktop sync client

Expected behavior

The file ~/Nextcloud/Notes/Note From Desktop.txt on the desktop computer should say

# Note From Desktop

The quick brown fox...

Does this work?

Note that if the edit in step 4 is made from another synced Desktop computer, then the expected behavior is observed.

Actual behavior

The Desktop sync client reports

Note From Desktop.txt could not be synced due to an error

Examining the error report in the settings dialog reveals

Note/Note From Desktop.txt: The downloaded file does not match the checksum, it will be resumed <CHECKSUM> != <CHECKSUM>

The server app reflects the correct state of the files, however.

Client configuration

• Client version: 3.3.6 (Fedora) (Latest distro package)
• Operating system: Fedora 35
• OS language: en-us
• Qt version used by client package (Linux only, see also Settings dialog): 5.15.2
• Client package (From Nextcloud or distro) (Linux only): distro
• Installation path of client: /usr/bin/nextcloud

Server configuration

• Nextcloud version: 21.0.1
• Storage Backend: S3 (Linode)
• OS: Debian 10
• Web server: Apache2
• PHP version: 7.3.31-1
• Database: MySQL 10.3.31-MariaDB-0

Nextcloud configuration:

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "nextcloud.millironx.com"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "21.0.1.1",
        "overwrite.cli.url": "https:\/\/nextcloud.millironx.com\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "default_phone_region": "US",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "htaccess.RewriteBase": "\/",
        "versions_retention_obligation": "auto",
        "app_install_overwrite": [
            "ocsms"
        ],
        "objectstore": {
            "class": "\\OC\\Files\\ObjectStore\\S3",
            "arguments": {
                "bucket": "nextcloud.millironx.com.storage",
                "autocreate": true,
                "key": "***REMOVED SENSITIVE VALUE***",
                "secret": "***REMOVED SENSITIVE VALUE***",
                "hostname": "us-east-1.linodeobjects.com",
                "port": 443,
                "use_ssl": true,
                "region": "us-east-1"
            }
        },
        "maintenance": false
    }
}

Logs

1. Client logfile: client_logfile.zip
2. Web server error log: error.log
3. Server logfile: nextcloud log (data/nextcloud.log): nextcloud.log

[ghost]

Maybe related to #4141

[MillironX]

Cannot reproduce after upgrading server to Nextcloud v22