Some questions to help diagnose:
1. Is this *always* reproducible?
2. Is this a regression? (is it known that it worked in an older version?)
3. Is this board-specific? (is it known that it works in other board with same version?)

Re #3,
1.I have seen it almost all the times on minnie today ( about 90% of the times)
2. Not sure if it's regression, the BT menu in settings page takes bit of time to load the devices list, but today it was just showing as no devices found
3.I have seen it on minnie today, will update the bug if i see it on other devices too.

Please refer attached video.

The issue seems to happen only when we go the settings page from the BT sub-menu in status tray. If we directly open settings page and then go to the BT menu, we can see the paired devices.

Deleted: IMG_8330.MOV 7.0 MB

	IMG_8330.MOV 7.0 MB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c2c1d5df85f845a919262af0ec606d1bbdc15114

commit c2c1d5df85f845a919262af0ec606d1bbdc15114
Author: Sonny Sasaka <sonnysasaka@chromium.org>
Date: Fri Aug 24 23:13:19 2018

settings: Always fetch Bluetooth device list when the page starts

Currently the page fetches the Bluetooth device list when there is a new
Bluetooth device added. This is not quite right, since we can't rely
on the expectation that a new Bluetooth device will be discovered often.
This problem has become even more visible ever since we implemented
Bluetooth device filter that dramatically lowers the probability of new
device appearing. As a result users often encounter that the Bluetooth
settings page show no devices at all (while actually will eventually
show some devices after waiting for very long).

The bug is due to race condition that bluetoothToggleState is updated
later than adapterStateChanged_. So the solution is to not rely on
bluetoothToggleState but adapterStateChanged when updating device list.

Bug:  851723 
Change-Id: Ib4d0207f04fd938ad1744c453f5bf24b9fd78ad0
Reviewed-on: https://chromium-review.googlesource.com/1187718
Commit-Queue: Sonny Sasaka <sonnysasaka@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586040}
[modify] https://crrev.com/c2c1d5df85f845a919262af0ec606d1bbdc15114/chrome/browser/resources/settings/bluetooth_page/bluetooth_subpage.js

 Issue 717678  has been merged into this issue.