Broken chapter thumbnails when using CDN

[fredflix 31]

Not too sure why or where to look, but I'm using Bunny CDN and everything works great except the chapter thumbnails which are broken. I get a black frame with the broken icon instead.
If I try to open the thumbnail in a new browser tab I get a blank page with the message: "Response Content-Length mismatch: too many bytes written (551 of 550)." The numbers vary depending on the thumbnail, but it's always 1 extra byte too many.
The chapter thumbnails appear to be broken in the web app, mobile app and tv app. They're also broken when you bring them up while playing something.
I'm guessing it has something to do on how these thumbnails are rendered as their url doesn't point to a file with a file extension?

emby.log

Edited September 20 by fredflix
Added server log

[Luke 43165]

Hi there, please attach the Emby server log from when the problem occurred:

How to Report a Problem

Thanks!

 

[fredflix 31]

Sure thing. Added it the OP.

Basically duplicate errors as it's trying to load multiple Chapter thumbs.

 

Edited September 20 by fredflix

[Luke 43165]

hi, can you try turning off the cdn?

[fredflix 31]

13 minutes ago, Luke said:

hi, can you try turning off the cdn?

Everything works fine without the CDN.

[Luke 43165]

Please temporarily enable debug logging and then attach a new and complete emby server log. thanks.

[fredflix 31]

19 minutes ago, Luke said:

Please temporarily enable debug logging and then attach a new and complete emby server log. thanks.

Sure. With the CDN enabled right?

Added debugging mode log with CDN enabled.

embyserver.txt

Edited September 20 by fredflix
Attached new debugging log

[Luke 43165]

what about when you mouse over the timeline during video playback? does it happen with those thumbnails?