StringIndexOutOfBoundsException when trying to delete last word cell

[digital-ember]

When I press SHIFT+ARROW RIGHT with the caret being at the end of a multiline text cell and press ENTER, I get this exception:
I use MPS 2023.3 and the latest mps-extensions 2023.2 (maybe that's already a bad idea).

java.lang.StringIndexOutOfBoundsException: begin 30, end 29, length 29
at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4606)
at java.base/java.lang.String.substring(String.java:2709)
at d.s.m.e.multiline.runtime//de.slisson.mps.editor.multiline.cells.MultilineSelection.deleteSelectedText(MultilineSelection.java:208)
at d.s.m.e.multiline.runtime//de.slisson.mps.editor.multiline.cells.MultilineSelection.lambda$executeDeleteSelectedText$1(MultilineSelection.java:201)
at jetbrains.mps.smodel.WorkbenchModelAccess$UndoContextSetup.run(WorkbenchModelAccess.java:377)
at jetbrains.mps.smodel.ActionDispatcher.dispatch(ActionDispatcher.java:98)
at jetbrains.mps.smodel.ActionDispatcher.lambda$wrap$0(ActionDispatcher.java:135)
at jetbrains.mps.smodel.ActionDispatcher.dispatch(ActionDispatcher.java:98)
at jetbrains.mps.smodel.ActionDispatcher.lambda$wrap$0(ActionDispatcher.java:135)
at jetbrains.mps.smodel.LockRunnable.run(LockRunnable.java:60)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:975)
at jetbrains.mps.smodel.TryRunPlatformWriteHelper.runWrite(TryRunPlatformWriteHelper.java:103)
at jetbrains.mps.smodel.TryRunPlatformWriteHelper.lambda$withPlatformWrite$1(TryRunPlatformWriteHelper.java:96)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:225)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:177)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:167)
at jetbrains.mps.smodel.WorkbenchModelAccess.executeCommand(WorkbenchModelAccess.java:312)
at jetbrains.mps.smodel.ProjectModelAccess2.executeCommand(ProjectModelAccess2.java:35)
at d.s.m.e.multiline.runtime//de.slisson.mps.editor.multiline.cells.MultilineSelection.executeDeleteSelectedText(MultilineSelection.java:201)
at d.s.m.e.multiline.runtime//de.slisson.mps.editor.multiline.cells.MultilineSelection.executeAction(MultilineSelection.java:119)
at jetbrains.mps.ide.editor.actions.Delete_Action.doExecute(Delete_Action.java:58)
at jetbrains.mps.workbench.action.BaseAction.lambda$actionPerformed$2(BaseAction.java:231)
at jetbrains.mps.workbench.action.ActionAccess$EmptyAccess.runWithAccess(ActionAccess.java:58)
at jetbrains.mps.workbench.action.BaseAction.actionPerformed(BaseAction.java:223)
at com.intellij.openapi.actionSystem.ex.ActionUtil.doPerformActionOrShowPopup(ActionUtil.java:344)
at com.intellij.openapi.keymap.impl.ActionProcessor.performAction(ActionProcessor.java:32)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher$myActionProcessor$1.performAction(IdeKeyEventDispatcher.kt:496)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcherKt.doPerformActionInner$lambda$4$lambda$3(IdeKeyEventDispatcher.kt:831)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:95)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcherKt.doPerformActionInner$lambda$4(IdeKeyEventDispatcher.kt:831)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareWithCallbacks(ActionUtil.java:381)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcherKt.doPerformActionInner(IdeKeyEventDispatcher.kt:829)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcherKt.access$doPerformActionInner(IdeKeyEventDispatcher.kt:1)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction$intellij_platform_ide_impl(IdeKeyEventDispatcher.kt:559)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction(IdeKeyEventDispatcher.kt:509)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processActionOrWaitSecondStroke(IdeKeyEventDispatcher.kt:448)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.inInitState(IdeKeyEventDispatcher.kt:441)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.kt:303)
at com.intellij.ide.IdeEventQueue.dispatchKeyEvent(IdeEventQueue.kt:620)
at com.intellij.ide.IdeEventQueue._dispatchEvent$lambda$11(IdeEventQueue.kt:581)
at com.intellij.openapi.application.impl.RwLockHolder.runWithEnabledImplicitRead(RwLockHolder.kt:75)
at com.intellij.openapi.application.impl.RwLockHolder.runWithImplicitRead(RwLockHolder.kt:67)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:581)
at com.intellij.ide.IdeEventQueue.access$_dispatchEvent(IdeEventQueue.kt:72)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:355)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:354)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:793)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:354)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:349)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$1(IdeEventQueue.kt:1014)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:114)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1014)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$7(IdeEventQueue.kt:349)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:848)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:391)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)