Once 2.4.2 is out we should disable the old tap. See See https://discourse.brew.sh/t/best-practice-on-moving-tap-to-another-hosting/7928
Relates to #24659
Comment From: philwebb
Fixed in https://github.com/pivotal-legacy/homebrew-tap/commit/23d5c990cfd5a502bdee0fed89c540cf6478c195