This version needs a pack format 7, because every resource pack that modify the toast wouldn't render the social interactions toast properly.
Relates to MC-202136.
MC-203362
Due to the new social interactions toast icon, pack format 6 should not be compatible with 1.16.4 and above.
Resolved
Won't Fix
1
(Unassigned)
Community Consensus
(Unassigned)
mojang_internal_1, resource-pack
1.16.4 Release Candidate 1, 1.16.4
Retrieved
Hello! I can confirm this in 1.16.4-rc1.