Remote backup fails "necessary data rewind wasn't possible" with Flysystem WebDAVAdapter

[cscognamiglio]

I am setting up laravel-backup on some laravel websites I manage, backup destination is a nextcloud instance at Hetzner.

I setup the Webdav adapter with Flyystem and with some little testings it seems to work:

// In AppServiceProvider.php
Storage::extend('webdav', function (Application $app, array $config) {
            $adapter = new WebDAVAdapter(new Client([
                'baseUri' => $config['baseUri'],
                'userName' => $config['userName'],
                'password' => $config['password'],
            ]));

            return new FilesystemAdapter(
                new Filesystem($adapter, $config),
                $adapter,
                $config
            );
        });

// A simple test
Storage::disk('webdav')->put(
            'backup-name/2024-01-31-12-17-20.zip', file_get_contents(public_path('some_biggish_file.zip'))
);

But when I run a backup I have the following error:

Copying zip failed because: Unable to write file at location: backup-name/2024-01-31-12-57-50.zip. necessary data rewind wasn't possible.

This is with PHP8.3, Laravel 10 and all packages at their latest versions.
NextCloud version is 27.1.5 but I don't have much control over it as it is managed by Hetzner.