[iOS, macOS] Fixed CollectionView group header size changes with ItemSizingStrategy#33161

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PureWeen merged 4 commits into

dotnet:inflight/candidatefrom

NanthiniMahalingam:fix-33130

Dec 19, 2025

Azure Pipelines / maui-pr-uitests (Android UITests CoreClr Controls (API 30) Lifecycle,ManualReview,Maps) succeeded Dec 18, 2025 in 16m 28s

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