do you have the install log?
cat /var/log/Calamares.log | curl -F 'f:1=<-' ix.io
Exported BUT I will most likely do another reinstall tonight. No need for you to look at it until I confirm if it happens a second time.
Okay, I did a completely fresh xfce net install today and this is the result after first boot, no settings changed:
Bluetooth is definitely installed, running and turned on.
this is only the bad interface design… see my screenshot:
this switcher on the blueberry window is not indication ore is responsive to bt is enable or not… if you open the settings you will see it says: Enable Bluetooth to edit
The output of systemctl status bluetooth will show you it is inactive (dead) and disabled:
And the app is blueberry, not blueman:
Fair enough!
never trust a GUI alone 
this is also caused by updating to GTK3 the switcher in blueberry will disable BT only for the user-session like making BT invisable but on system level it can be enabled or disabled