Cosmetic Filter blocks page elements doesn't work under properties when copying the element

[MrWaste]

Cosmetic Filter blocks page elements doesn’t work under properties when copying the element:
How can this issue be reproduced?

1. Go to inspect an element on a page
2. Click properties
3. Click an element and you won’t able to copy and paste the custom element, only type it manually.

Expected result:
You no longer can copy and paste the custom element under the properties tab.

Brave Version(Version 1.12.112 Chromium: 84.0.4147.125 (Official Build) (64-bit):

Additional Information:

I hate typing out the full element every time I see a new ad somewhere on the internet, its a waste of time…

Proof:

You were allow back in the day but not anymore, why is this happening?

Link: https://support.brave.com/hc/en-us/articles/360018039072-How-do-I-block-additional-page-elements-