What type of stile is this? - app crashing when answering question

[RJC0235]

When i try and answer the question "what type of stile is this?" with the Wooden step-over stile, the app crashes.

All data is saved, except that quest. After a few crashes my phone suggested clearing cache, with no success.

This happened both when i had some 600 quests ready to upload, and none to upload.

App version is V62.0
Android version is Android 12, on Samsung One UI version 4.1 (galaxy S10e)

I have also tried this on a second android device (galaxy Zflip5), with the same results

Here is a YouTube video of the issue - https://youtube.com/shorts/mB1bifsFHdM?feature=share

[paulklie]

I can reproduce.

[westnordost]

Same issue exists for bike rental type quest.

Stack trace:

java.lang.IllegalStateException: Enums cannot be serialized polymorphically with 'type' parameter. You can use 'JsonBuilder.useArrayPolymorphism' instead
                                                                                                    	at kotlinx.serialization.json.internal.PolymorphicKt.checkKind(Polymorphic.kt:71)
                                                                                                    	at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:253)
                                                                                                    	at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableElement(AbstractEncoder.kt:80)
                                                                                                    	at kotlinx.serialization.internal.CollectionLikeSerializer.serialize(CollectionSerializers.kt:69)
                                                                                                    	at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:259)
                                                                                                    	at kotlinx.serialization.json.internal.JsonStreamsKt.encodeByWriter(JsonStreams.kt:99)
                                                                                                    	at kotlinx.serialization.json.Json.encodeToString(Json.kt:125)
                                                                                                    	at de.westnordost.streetcomplete.data.preferences.Preferences.setLastPicked(Preferences.kt:161)