Fix: Double hashed value for background-color #13050

Job	Run time
Core running from build / Core running from build / Linux	2m 9s
Core running from src / Core running from src / Linux	2m 5s
Core running from build / Core running from build / Windows	4m 12s
Core running from src / Core running from src / Windows	3m 59s
Core running from build / Core running from build / MacOS	2m 17s
Core running from src / Core running from src / MacOS	2m 22s
Gutenberg running from build / Gutenberg running from build / Linux	8m 24s
Gutenberg running from src / Gutenberg running from src / Linux	8m 38s
Gutenberg running from build / Gutenberg running from build / Windows	12m 53s
Gutenberg running from src / Gutenberg running from src / Windows	11m 21s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 35s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 47s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 16m 42s

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