Dolphin doesn't show (all) linked folders

[Andy]

Since upgrading from 18.04 to 18.10 a few days ago, Dolphin doesn't show two linked folders anymore while it displays everything else as before.
They are links to /mnt/hdd and /mnt/ssd where I have two mounted two additional physical drives.
The links work in Konsole and any other application and yet Dolphin won't show them.
The source folders are owned by my user and the user has rwx permissions on the folders.

Dolphin does however show at least one other linked folder where the actual source is under my home directory (e.g. PlayOnLinux -> /home/andy/.PlayOnLinux is displayed correctly).

In general, Dolphin must be aware of the two linked folders it doesn't display because when I start typing the path /home/andy/HDD in the address bar, Dolphin suggests the folder directly after typing the H.
Navigating to the folder this way and browsing it works as expected as well.

I also searched all of Dolphins settings but couldn't find anything that seems related to the problem or even solves it.

I hope you can reproduce the bug and help me solve it.
Also, please be gentle with me, this is my first bug report. ;)

Best regards
Andy

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
Ubuntu 18.10
2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
4:18.04.3-0ubuntu2
3) What you expected to happen
Opening dolphin should display all files/folders including the two links described above in my home folder (except hidden files)
4) What happened instead
Opening dolphin displays all files/folders in my home folder EXCEPT for the two links described above (and hidden files)

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: dolphin 4:18.04.3-0ubuntu2
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Jan 25 19:01:04 2019
ExecutablePath: /usr/bin/dolphin
InstallationDate: Installed on 2018-07-11 (198 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: dolphin
UpgradeStatus: Upgraded to cosmic on 2019-01-18 (6 days ago)

[Andy (yxandyyx)]

I forgot to mention that the bug also occurs for a newly created user account, so I assume it is not directly related to configuration file changes I might have made.