Konsole doesn't honour "Initial directory" setting

[Uqbar]

1. Open konsole
2. Go to Settings-->Edit Current profile-->General
3. Uncheck the box "Start in (the) same directory as (the) current tab"
4. Edit "Initial directory" with navigation widget to some directory like /tmp or your home
5. Click on "Apply" and then to "OK"
6. Close the konsole application
7. Open the konsole application again
8. Go to Settings-->Edit Current profile-->General

Expected behavior: find the same settings as in previous points #3 and #4

Actual behavior: Setting done at point #3 is honored, while the one at point #4 is empty.

Note.
If you skip point #3, the button "Apply" will be disabled.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: konsole 4:15.12.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-lowlatency 4.4.6
Uname: Linux 4.4.0-21-lowlatency x86_64
NonfreeKernelModules: pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv xt_multiport iptable_filter ip_tables x_tables 8812au cfg80211 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi hp_wmi sparse_keymap intel_rapl snd_hda_intel x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec kvm_intel kvm snd_hda_core irqbypass crct10dif_pclmul snd_hwdep crc32_pclmul usblp input_leds snd_pcm aesni_intel snd_seq_midi aes_x86_64 lrw gf128mul glue_helper snd_seq_midi_event ablk_helper cryptd snd_rawmidi serio_raw snd_seq snd_seq_device snd_timer snd mei_me soundcore mei lpc_ich shpchp mac_hid 8250_fintek parport_pc ppdev lp parport autofs4 xfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 multipath linear uas usb_storage hid_generic usbhid hid raid0 amdkfd amd_iommu_v2 radeon i915 ttm i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ahci psmouse drm r8169 libahci mii wmi fjes video
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Apr 25 11:19:46 2016
InstallationDate: Installed on 2016-04-22 (2 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: konsole
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jim Howell (jimbocoder)]

Confirmed on 16.04 LTS with:

Linux: 4.4.0-47-generic
Qt: 5.5.1
KDE Frameworks: 5.18.0
Konsole: 15.12.3