Using the Pocillo icon set, when one turns off the notifications the panel icon is missing.

Using the Pocillo icon set, when one turns off the notifications the panel icon is missing.

That is a bug from upstream. I’ve proposed a fix for upstream. They haven’t yet accepted it.
I’m going to upload a new version of budgie desktop today/tomorrow with this and other fixes.
The disabled notification icon works correctly on Solus. Turns out that one needs to modify the icon theme:
add a theme/symbolic/status folder that contains the notification-disabled-symbolic.svg icon and modify the index.theme to add:
Directories=symbolic/status
[symbolic/status]
Context=Status
Size=16
MinSize=16
MaxSize=512
Type=Scalable
fix just released for 18.10 - so all should be ok now.
Yes, every theme works now: Thanks