Windows build number: 10.0.19041.329 (2004)
PowerToys version: 0.18.2
PowerToy module for which you are reporting the bug (if applicable): FancyZones
The window is resized to the zone and nothing else happens.
A notification about Bluetooth calls from the Your Phone app appears every time after dropping a window.
Do you still want to make and receive calls on your PC?
The Bluetooth connection between your phone and PC has been disconnected.
via Your Phone
YesNo
It does not matter what you do with this notification (press Yes or No or dismiss it), it will appear again next time you drop a window into a zone.

…in the meantime, I have suppressed Calls notifications in Settings. I imagine this will also prevent incoming call notifications from appearing.

@enricogior anyone on your team have Your Phone installed?
@daguej
can you verify if this is still happening with the latest version of PowerToys? https://github.com/microsoft/PowerToys/releases
Thanks.
@enricogior I can confirm that this still happens in v0.19.1.
I noticed a few interesting things while reproducing, and believe I have narrowed down the cause:
So looks like Focus Assist is the culprit. Not sure if there's a bug in Your Phone's handling of Focus Assist turning off, but it does seem like FancyZones should not be triggering Focus Assist anyway.
@daguej
thank you for debugging the problem!
any news guys?
Most helpful comment
@enricogior I can confirm that this still happens in v0.19.1.
I noticed a few interesting things while reproducing, and believe I have narrowed down the cause:
So looks like Focus Assist is the culprit. Not sure if there's a bug in Your Phone's handling of Focus Assist turning off, but it does seem like FancyZones should not be triggering Focus Assist anyway.