Have mention colours changed?

Just noticed that a mention of me has a completely different colour compared to what it has been before.
It appears in a gold-yellow like colour now.
Just using the dark theme from GitHub so not sure if this is a theme thing or if this is a general change to (own) mentions.

Example:

This doesn’t bother me that much. It’s more an observation and curiosity about what the actual reasons behind this change are.