Seedling top growth possible been eaten ?

Hi all

my blackberry auto has been up and running for approx 12 days. 2 days ago I noticed that the top growth not looking normal and after 2 days it’s still looks the same. The first set of true leaves are still growing but anything above seems stunted by this top growth. Looks like it’s been eaten.C19FC288-7F85-4705-8B38-838D22570FA6.jpeg
 
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