Guest_app creates homedir

guest_app created new guest user. user receives e-mail, have access to shared folder. All seems good. But in owncloud.log:
{"reqId":"XTSFP38AAQEAAFD0@3kAAAAH","level":3,"time":"2019-07-21T18:31:11+03:00","remoteAddr":"127.0.0.1","user":"rishat","app":"no app in context","method":"PUT","url":"\/owncloud\/index.php\/apps\/guests\/users","message":"User backend OC\\User\\Database is returning home: \/var\/www\/owncloud\/data\/mail@server.test for user: mail@server.test which differs from existing value: "} {"reqId":"XTSIt38AAQEAAE1JLTQAAAAF","level":3,"time":"2019-07-21T18:46:00+03:00","remoteAddr":"127.0.0.1","user":"mail@server.test","app":"no app in context","method":"POST","url":"\/owncloud\/index.php\/login","message":"The skeleton folder is not accessible"}
Why guest need sekeleton? It tries to create homedir to guest user?

After all folder named “mail@server.test” created in data directory. It contains “cache/”, “files/”, “thumbnails/”. “thumbnails/” filled with many folders like “24383/”, “24384/”, etc…

In owncloud.log we can see an attempt to rescan: {"reqId":"Q7EORV5g8KB8t2RS5aAl","level":3,"time":"2019-07-22T09:30:01+03:00","remoteAddr":"","user":"--","app":"files","method":"--","url":"--","message":"Exception: {\"Exception\":\"OC\\\\ForbiddenException\",\"Message\":\"\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Utils\\\/Scanner.php(139): OC\\\\Files\\\\Utils\\\\Scanner->shouldScan(Object(OC\\\\Files\\\\Mount\\\\MountPoint))\\n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/files\\\/lib\\\/BackgroundJob\\\/ScanFiles.php(87): OC\\\\Files\\\\Utils\\\\Scanner->backgroundScan('')\\n#2 \\\/var\\\/www\\\/owncloud\\\/apps\\\/files\\\/lib\\\/BackgroundJob\\\/ScanFiles.php(111): OCA\\\\Files\\\\BackgroundJob\\\\ScanFiles->runScanner(Object(OC\\\\User\\\\User))\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/Job.php(66): OCA\\\\Files\\\\BackgroundJob\\\\ScanFiles->run(NULL)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/TimedJob.php(63): OC\\\\BackgroundJob\\\\Job->execute(Object(OC\\\\BackgroundJob\\\\JobList), Object(OC\\\\Log))\\n#5 \\\/var\\\/www\\\/owncloud\\\/cron.php(120): OC\\\\BackgroundJob\\\\TimedJob->execute(Object(OC\\\\BackgroundJob\\\\JobList), Object(OC\\\\Log))\\n#6 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Utils\\\/Scanner.php\",\"Line\":192}"}
There are no errors like this before guest user was created.

I think, something goes wrong…

Debian 9.9. Apache/2.4.25 MySQL 10 PHP 7.0.33 ownCloud 10.2.1 (stable). Fresh install from zip-archive