Photos App doesn't show thumbs after Hub 10 update

I’ve updated to Hub 10 (31.0.0) and when I go to the photos app I only see this.

I don’t really use photos that much (don’t upload many photos there) but I definitly had correct thumbs before v31.0.0.

I don’t want many generated thumbnail versions of a picture (which waste memory on my hd) - so I use these settings (set 'enable_previews' => false, not good?).

 'enabledPreviewProviders' =>
  array (
    0 => 'OC\\Preview\\BMP',
    1 => 'OC\\Preview\\GIF',
    2 => 'OC\\Preview\\JPEG',
    3 => 'OC\\Preview\\Krita',
    4 => 'OC\\Preview\\MarkDown',
    5 => 'OC\\Preview\\MP3',
    6 => 'OC\\Preview\\OpenDocument',
    7 => 'OC\\Preview\\PNG',
    8 => 'OC\\Preview\\TXT',
    9 => 'OC\\Preview\\XBitmap',
    10 => 'OC\\Preview\\MSOffice2003',
    11 => 'OC\\Preview\\MSOffice2007',
    12 => 'OC\\Preview\\MSOfficeDoc',
    13 => 'OC\\Preview\\Image',
  ),
  'preview_max_x' => 1024,
  'preview_max_y' => 1024,
  'preview_max_filesize_image' => 14,
  'preview_max_memory' => 256,
  'preview_max_scale_factor' => NULL,
  'enable_previews' => false,
  'memories.index.path.blacklist' => '\\/@(Recycle|eaDir|trash|Joplin)\\/',
  'jpeg_quality' => 78,
  'memories.viewer.high_res_cond_default' => 'always',

Update: Looks like I really have to set enable_previews to true for this, correct? I set minimal values like this and enabled enable_previews, now the photos app shows the thumbs again!

./occ config:app:set --value="64 256" previewgenerator squareSizes
./occ config:app:set --value="256 4096" previewgenerator squareUncroppedSizes
./occ config:app:set --value="" previewgenerator widthSizes
./occ config:app:set --value="" previewgenerator heightSizes
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