Under the hood
Useful1 Signal1
Your status line script gets the same JSON; vim state is now passed in explicitly.
What's wrong with this entry?
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What
The builder for the JSON handed to a custom status line command now receives a vimModeEnabled argument from its caller and emits the vim block from it, rather than reading a global at render time. The JSON your script sees is unchanged.
Evidence
vimModeEnabled
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.