There are multiple CVEs in multiple Chrome-only non-standards that Chrome spits out by the hundreds in the past few years. They have no issues releasing those, supporting them, and fixing them.
Somehow they have an issue with supporting, fixing (and updating to latest version) this particular one. Possibly because it doesn't result in promotions.
Somehow they have an issue with supporting, fixing (and updating to latest version) this particular one. Possibly because it doesn't result in promotions.