System.Text.Json: Fix polymorphic state bug when using ReferenceHandler.IgnoreCycles #111808
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Clear the polymorphic state after ignoring a reference to prevent subsequent object writes from inheriting it.
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Clear the polymorphic state after ignoring a reference in an array to prevent subsequent objects from inheriting it.
Add a test which triggered an assertion in
runtime/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonConverter.MetadataHandling.cs
Line 74 in 03b2d3d
and covers the scenario reported in #111790
Fixes #111790