tengu_glimmering_glade defaults true but has no reader in the build.
What
A flag helper was added beside the existing bridge flags, with a built-in fallback of true. No code in this build reads it, so it changes nothing today and exists for a server-side rollout to hook into later.
Evidence
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this build
New in this build: tengu_glimmering_glade