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Version 3 is now supported in WordPress 6.6.
Reference: https://developer.wordpress.org/block-editor/reference-guides/theme-json-reference/theme-json-living/
Migrating from v2 to v3: https://developer.wordpress.org/block-editor/reference-guides/theme-json-reference/theme-json-migrations/#migrating-from-v2-to-v3
Type of change
PATCH: backwards compatible change
This doesn't appear to break anything. Although, there are migration steps in the link above that add two default values:
settings.typography.defaultFontSizes
andsettings.spacing.defaultSpacingSizes
.