No upgradeable packages with ATD found, but with apt-get

ATM, there are 34 upgradeable packages on my Deb/Buster system:
```
LANG="C"; au
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
bind9-host bluez-firmware bzip2 cron dmsetup libbind9-161 libbz2-1.0 libdevmapper1.02.1 libdns-export1104
libdns1104 libexpat1 libgssapi-krb5-2 libisc-export1100 libisc1100 libisccc161 libisccfg163 libk5crypto3 libkrb5-3
libkrb5support0 liblwres161 libplymouth4 libraspberrypi-bin libraspberrypi-dev libraspberrypi-doc libraspberrypi0
libwbclient0 nano pi-bluetooth plymouth raspberrypi-bootloader raspberrypi-kernel raspberrypi-net-mods
raspberrypi-sys-mods raspi-config
34 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 98.3 MB of archives.
After this operation, 83.5 MB of additional disk space will be used.
```

But AptToDate didn't found any of these:
```
Internals:
.FhemMetaInternals 1
.eventMapCmd Aktualisieren:noArg
CFGFN ./cfg.d/g/utilities/network/hosts/hab0.cfg
DEF localhost
FUUID 5d260c8e-f33f-5647-3900-39a5eec5345d9525
FVERSION 42_AptToDate.pm:v1.4.5-s19639/2019-06-18
HOST localhost
NAME g.utilities.network.hosts.hab0.packet_manager
NOTIFYDEV global,g.utilities.network.hosts.hab0.packet_manager
NR 1685
NTFY_ORDER 50-g.utilities.network.hosts.hab0.packet_manager
STATE 0 Updates verfügbar
TYPE AptToDate
VERSION v1.4.5
.attraggr:
.attrminint:
.fhem:
aptget:
cmd repoSync
debug 0
distupgrade 0
host localhost
lang de
packages:
READINGS:
2019-05-23 22:08:31 .updatedList {}
2019-05-23 22:08:34 .upgradeList {}
2019-05-14 00:43:14 os-release_BUG_REPORT_URL http://www.raspbian.org/RaspbianBugs
2019-05-14 00:43:14 os-release_HOME_URL http://www.raspbian.org/
2019-05-14 00:43:14 os-release_ID raspbian
2019-05-14 00:43:14 os-release_ID_LIKE debian
2019-05-14 00:43:14 os-release_NAME Raspbian GNU/Linux
2019-06-21 00:36:30 os-release_PRETTY_NAME Raspbian GNU/Linux 10 (buster)
2019-05-14 00:43:14 os-release_SUPPORT_URL http://www.raspbian.org/RaspbianForums
2019-06-21 00:36:30 os-release_VERSION 10 (buster)
2019-06-21 00:36:30 os-release_VERSION_CODENAME buster
2019-06-21 00:36:30 os-release_VERSION_ID 10
2019-05-14 00:43:14 os-release_language de
2019-07-16 00:04:30 repoSync fetched done
2019-07-16 00:04:30 state system is up to date
2019-05-23 22:08:31 toUpgrade successful
2019-05-23 22:08:34 updatesAvailable 0
2019-05-23 22:08:34 upgradeListAsJSON
helper:
lastSync 2019-07-16
Attributes:
alias Paketmanager-Status
devStateIcon system.updates.available:security@red system.is.up.to.date:security@green:repoSync .*in.progress:system_fhem_reboot@orange errors:message_attention@red
eventMap repoSync:Aktualisieren
group hab0.home.net
icon debian@black
room Admin->Netzwerk
sortby 100
stateFormat [$name:updatesAvailable] Updates verfügbar
upgradeListReading 1
webCmd Aktualisieren
```