Cycleway quest: Illegal state exception

[westnordost]

Thread: QuestControllerThread
App version: 3.2
Stack trace:
java.lang.IllegalStateException: The key 'sidewalk' is already being modified.
at de.westnordost.streetcomplete.data.osm.changes.StringMapChangesBuilder.checkDuplicate(StringMapChangesBuilder.java:75)
at de.westnordost.streetcomplete.data.osm.changes.StringMapChangesBuilder.add(StringMapChangesBuilder.java:38)
at de.westnordost.streetcomplete.data.osm.changes.StringMapChangesBuilder.addOrModify(StringMapChangesBuilder.java:58)
at de.westnordost.streetcomplete.quests.bikeway.AddCycleway.applyCyclewayAnswerTo(AddCycleway.java:117)
at de.westnordost.streetcomplete.quests.bikeway.AddCycleway.applyAnswerTo(AddCycleway.java:57)
at de.westnordost.streetcomplete.data.QuestController.solveOsmQuest(QuestController.java:293)
at de.westnordost.streetcomplete.data.QuestController.lambda$solveQuest$1$QuestController(QuestController.java:194)
at de.westnordost.streetcomplete.data.QuestController$$Lambda$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.os.HandlerThread.run(HandlerThread.java:61)