IllegalStateException: ElementIconRequest hashCode changed while stored in Caffeine cache

[danberindei]

I started seeing this exception after upgrading to IntelliJ 2023.2.5.

java.lang.IllegalStateException: An invalid state was detected that occurs if the key's equals or hashCode was modified while it resided in the cache. This violation of the Map  contract can lead to non-deterministic behavior (key: com.intellij.psi.impl.ElementBase$ElementIconRequest@20d0aae, key type: ElementIconRequest, node type: PSMS, cache type: SSMS).
	at com.github.benmanes.caffeine.cache.BoundedLocalCache.requireIsAlive(BoundedLocalCache.java:294)
	at com.github.benmanes.caffeine.cache.BoundedLocalCache.lambda$doComputeIfAbsent$14(BoundedLocalCache.java:2698)
	at java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1940)
	at com.github.benmanes.caffeine.cache.BoundedLocalCache.doComputeIfAbsent(BoundedLocalCache.java:2683)
	at com.github.benmanes.caffeine.cache.BoundedLocalCache.computeIfAbsent(BoundedLocalCache.java:2666)
	at com.github.benmanes.caffeine.cache.LocalCache.computeIfAbsent(LocalCache.java:112)
	at com.github.benmanes.caffeine.cache.LocalManualCache.get(LocalManualCache.java:62)
	at com.intellij.ui.IconDeferrerImpl.defer(IconDeferrerImpl.kt:75)
	at com.intellij.ui.icons.CoreIconManager.createDeferredIcon(CoreIconManager.kt:117)
	at com.intellij.psi.impl.ElementBase.computeIcon(ElementBase.java:85)
	at com.intellij.psi.impl.ElementBase.getIcon(ElementBase.java:62)
	at com.andrey4623.rainbowcsv.CsvFile.getIcon(CsvFile.java:30)
	at com.intellij.ide.projectView.impl.nodes.PsiFileNode.updateImpl(PsiFileNode.java:65)
	at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.lambda$doUpdate$1(AbstractPsiBasedNode.java:213)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:895)
	at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.doUpdate(AbstractPsiBasedNode.java:166)
	at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.lambda$update$0(AbstractPsiBasedNode.java:162)
	at com.intellij.util.AstLoadingFilter.lambda$toComputable$2(AstLoadingFilter.java:172)
	at com.intellij.util.AstLoadingFilter.disallowTreeLoading(AstLoadingFilter.java:130)
	at com.intellij.util.AstLoadingFilter.disallowTreeLoading(AstLoadingFilter.java:119)
	at com.intellij.util.AstLoadingFilter.disallowTreeLoading(AstLoadingFilter.java:109)
	at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.update(AbstractPsiBasedNode.java:162)
	at com.intellij.ide.util.treeView.PresentableNodeDescriptor.getUpdatedPresentation(PresentableNodeDescriptor.java:88)
	at com.intellij.ide.util.treeView.PresentableNodeDescriptor.update(PresentableNodeDescriptor.java:32)
	at com.intellij.ui.tree.StructureTreeModel$Node.update(StructureTreeModel.java:486)
	at com.intellij.ui.tree.StructureTreeModel.invalidateInternal(StructureTreeModel.java:244)
	at com.intellij.ui.tree.StructureTreeModel.lambda$invalidate$5(StructureTreeModel.java:208)
	at com.intellij.ui.tree.StructureTreeModel.lambda$onValidThread$2(StructureTreeModel.java:143)
	at com.intellij.ui.tree.StructureTreeModel.lambda$onValidThread$1(StructureTreeModel.java:121)
	at com.intellij.util.concurrency.Invoker$Task.run(Invoker.java:306)