WhatsApp and Android Messages notification is missing / no red dot when a new message is received

When I get a new message in WhatsApp or Android Messages and I have another app opened, there is no red dot on WA/AM icon. In case of other services (works at least with Slack and GMail) that dot is visible and useful.

To be precise:

Stationversion 1.39.2
Electron 4.0.4
Chrome 69.0.3497.106
Node 10.11.0
v8 6.9.427.24-electron.0
@getstation/services 0.27.0

$ uname -a
Linux (...) 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a                                                                                                                                                                                                                              
No LSB modules are available.
Distributor ID:	LinuxMint
Description:	Linux Mint 19 Tara
Release:	19
Codename:	tara

Mint version: Cinnamon
Cinnamon version: 3.8.8

Would you need any more details, just ask.

I have this issue too, on latest stable on macOS. I get notification messages but no red dot.