jQuery warnings on admin interface

Matrix Version: v6.91.0

Hi all, has anyone noticed jQuery warnings on the developer tool’s console when loading an asset in admin interface? It happens to me on every tabs: Details, Content, Metadata, Workflow, Linking etc.

jquery.js?4437879000734873464-1782712547-89476:2 The specified value "!" does not conform to the required format.  The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.
/_admin/?screen=linking&assetid=xxx&tab=children:1 The resource https://www.example.com/__lib/frontend/dist/images/symbol-defs.svg was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it has an appropriate `as` value and it is preloaded intentionally.

xxx being the asset currently on the screen.

I wonder if this is already in Squiz’s devs radar to fix.