Shift Enter cannot be stopped/revoked

[rplc]

📝 Provide detailed reproduction steps (if any)

• Open https://jsfiddle.net/c7xopg0f/3/
• Type "Foo", hit enter key -> enter key is correctly stopped
• Continue typing "Bar", hit shift+enter -> shit+enter is not really stopped (model does not register any changes but the editing view inserts a br)
• Continue typing "F" -> error

Uncaught CKEditorError: n is null
Read more: https://ckeditor.com/docs/ckeditor5/latest/support/error-codes.html#error-n is null
    Pu deletecontent.ts:81
    deleteContent model.ts:701
    decorate observablemixin.ts:277
    fire emittermixin.ts:241
    e observablemixin.ts:281
    execute inserttextcommand.ts:92
    _runPendingChanges model.ts:1109
    enqueueChange model.ts:349
    execute inserttextcommand.ts:85
    decorate observablemixin.ts:277
    fire emittermixin.ts:241
    e observablemixin.ts:281
    execute commandcollection.ts:73
    execute editor.ts:620
    init input.ts:166
    fire emittermixin.ts:241
    Va bubblingemittermixin.ts:207
    fire bubblingemittermixin.ts:118
    vw inserttextobserver.ts:84
    fire emittermixin.ts:241
    Va bubblingemittermixin.ts:207
    fire bubblingemittermixin.ts:118
    fire domeventobserver.ts:106
    onDomEvent inputobserver.ts:181
    observe domeventobserver.ts:82
    fire emittermixin.ts:241
    t emittermixin.ts:340
    attach emittermixin.ts:270
    _addEventListener emittermixin.ts:314
    listenTo emittermixin.ts:894
    listenTo emittermixin.ts:162
    listenTo emittermixin.ts:115
    listenTo emittermixin.ts:112
    observe domeventobserver.ts:80
    observe domeventobserver.ts:79
    attachDomRoot view.ts:322
    init inlineeditorui.ts:96
    create inlineeditor.ts:205
    promise callback*create/< inlineeditor.ts:205
    create inlineeditor.ts:194
    <anonymous>

✔️ Expected result

I would expect according to the doc codes (https://ckeditor.com/docs/ckeditor5/latest/api/module_engine_view_document-Document.html#event-enter) that enter and shift+enter are stopped and nothing happens when hitting enter or shift+enter. Same behaviour can be reproduced with the commented out section, using the beforeinput event.

❌ Actual result

Enter event is stopped, nothing happens, so far so good. Shift+Enter does not change anything in the model but the view contains an additional br. And when you continue typing in the new line an error is thrown.

📃 Other details

Tested in Chrome and Firefox.

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