TYPO3 Core

I am using 9.5.20 and try to implement a FLUIDTEMPLATE.
Here the setup:

 page.shortcutIcon = fileadmin/Page/Resources/Public/Images/cowboy-hat.ico
 page = PAGE 
 page.typeNum = 0
 page.10 = FLUIDTEMPLATE 
 page.10 {
     format = html
     # Pfad zu der HTML Vorlage der Webseite 
     file = fileadmin/Page/Resources/Private/Page/Layouts/MainLayot.htmlMainLayout.html
     # Pfad zu eingebundenen Partials 
     partialRootPath = fileadmin/Page/Resources/Private/Partials/
     # Pfad zur Layout Datei 
     layoutRootPath = fileadmin/Page/Resources/Private/Layouts/
     # Pfad zur Layout Datei 
     templateRootPath = fileadmin/Resources/Private/Templates/     
     variables {
 <!--    page_title = TEXT
         page_title.field = subtitle // title -->

         # Verknüpfung der Inhalte mit dem Backend Layout 
         contentNormal < styles.content.get
         content.select.where = colPos = 10
        contentLeft < styles.content.get
        contentLeft.select.where = colPos = 11
        contentRight < styles.content.get
        contentRight.select.where = colPos = 12     }
 }
page.10.file.stdWrap.cObject = CASE
page.10.file.stdWrap.cObject {
     key.data = levelfield:-1, backend_layout_next_level, slide
     key.override.field = backend_layout

     # Einbindung des ersten HTML Templates 
     1 = TEXT
     1.value = fileadmin/Resources/Private/Templates/Layout1ColumnPage.html

     # Einbindung des zweiten HTML Templates 
     2 = TEXT
     2.value = fileadmin/Resources/Private/Templates/Layout2ColumnPage.html

     # Einbindung der Standard HTML Vorlage 
     default = TEXT
     default.value = fileadmin/Resources/Private/Templates/Layout1ColumnPage.html
  }

But I get an error from a select see attached file.
Attached you will find the tt_content.sql file

All content was save by Typo3

I think, that it is a bug