Flight not enabled in zone where required currents was reduced

[AutumnalSprout]

Same issue in Churning Mists. Not all currents were collected before 6.0, but flight was not unlocked after 6.0 update despite reaching the new requirement. Tried both teleporting and walking into the map just in case, but flight never got unlocked.
Likewise, the achievement "Freebird: Churning Mists" is not complete.

[ATanklessJob]

Exact same issue as above with the Churning Mists here. Screenshot is the same as what I can see in my menu as well.

[TheSheed]

For me its happening with Yanxia