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Strange failure of a LED filament lamps At KFC, there were lots of failed LED filament lamps, where the filaments glowing only at the ends, much like a preheat fluorescent with a stuck starter. What can cause this?

Strange failure of a LED filament lamps

At KFC, there were lots of failed LED filament lamps, where the filaments glowing only at the ends, much like a preheat fluorescent with a stuck starter.
What can cause this?

4~2.jpg MVI_7600_MP4_snapshot_00_17_728.jpg IMG_7626.JPG IMG_7627.JPG 4~2.jpg
File information
Filename:IMG_7626.JPG
Album name:dor123 / LEDs (Including LED lighting), Lasers and lighting gadgets
Filesize:424 KiB
Date added:Dec 28, 2023
Dimensions:2048 x 1536 pixels
Displayed:9 times
Color Space:sRGB
DateTime Original:2023:12:28 18:47:20
Exposure Bias:0 EV
Exposure Mode:0
Exposure Time:1/80 sec
FNumber:f/5.6
Flash:No Flash
Focal length:42.915 mm
ISO:160
Make:Canon
Max Aperture:f/5.6
Model:Canon PowerShot SX730 HS
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=27160
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merc   [Dec 30, 2023 at 07:44 PM]
Interesting! Never seen anything like this. Common failures are filament pair off or flashing, possibly also dim glow of all filaments. Maybe the central part of the filament got short circuited and only ends survived thanks to better heat dissipation?

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