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### Steps to reproduce
1. Installed Nextcloud Hub II and Desktop Client 3.4.1
2. The client freezes when trying to upload a changed file.
3. Currently not clear which condidition triggers the error. The log message is unspecific.
### Expected behaviour
The client should sync the file with the server.
### Actual behaviour
The client freezes. See this related issue: https://github.com/nextcloud/desktop/issues/4106
### Server configuration
**Operating system:** Ubuntu 18.04.6 LTS (Bionic Beaver)
**Nextcloud version:** (see Nextcloud admin page) version: 23.0.0.10
**Updated from an older Nextcloud/ownCloud or fresh install:** Upgraded since OwnCloud 5 or 6…
### Logs
#### Web server error log
<details>
<summary>Web server error log</summary>
```
Dez 28 17:09:43 jarvis Nextcloud[21403]: {"reqId":"0hgEj8EYAmtZMK2RzNhl","level":4,"time":"2021-12-28T17:09:43+01:00","remoteAddr":"IP_ADDRESS_REDACTED","user":"lars","app":"webdav","method":"POST","url":"/remote.php/dav/bulk","message":"{\"Exce
ption\":\"Sabre\\\\DAV\\\\Exception\",\"Message\":\"Unknown error while seeking content\",\"Code\":500,\"Trace\":[{\"file\":\"/var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php\",\"line\":129,\"function\":\"isAt\",\"cl
ass\":\"OCA\\\\DAV\\\\BulkUpload\\\\MultipartRequestParser\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/apps/dav/lib/BulkUpload/BulkUploadPlugin.php\",\"line\":69,\"function\":\"isAtLastBoundary\",\"class\":\"OCA\\\\DAV\\\\BulkUploa
d\\\\MultipartRequestParser\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php\",\"line\":89,\"function\":\"httpPost\",\"class\":\"OCA\\\\DAV\\\\BulkUpload\\\\BulkUploadPlugin\",\"type\":\
"->\"},{\"file\":\"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php\",\"line\":472,\"function\":\"emit\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php\"
,\"line\":253,\"function\":\"invokeMethod\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php\",\"line\":321,\"function\":\"start\",\"class\":\"Sabre\\\\DAV\\\\Serv
er\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/apps/dav/lib/Server.php\",\"line\":339,\"function\":\"exec\",\"class\":\"Sabre\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php\",\"lin
e\":35,\"function\":\"exec\",\"class\":\"OCA\\\\DAV\\\\Server\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/remote.php\",\"line\":166,\"args\":[\"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php\"],\"function\":\"require_once\"}],\"
File\":\"/var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php\",\"Line\":111,\"CustomMessage\":\"--\"}","userAgent":"Mozilla/5.0 (Linux) mirall/3.4.1git (Nextcloud, arch-5.15.11-arch2-1 ClientArchitecture: x86_64 OsArchi
tecture: x86_64)","version":"23.0.0.10"}
```
</details>