Hello Mod developer,
today, when I started my Minecraft Server everything seemed normal but a few of my images were just black. Then I looked in the Server log but I could not find anything. So I looked in my Client log and I found something:
[15:09:46] [Render thread/INFO]: Injecting existing registry data into this CLIENT instance
[15:09:46] [Render thread/WARN]: Registry minecraft:item: Object did not get ID it asked for. Name: camera:image_frame Expected: 2934 Got: 4010
[15:09:46] [Render thread/WARN]: Registry minecraft:item: Object did not get ID it asked for. Name: camera:camera Expected: 2935 Got: 4011
[15:09:46] [Render thread/WARN]: Registry minecraft:item: Object did not get ID it asked for. Name: camera:image Expected: 2936 Got: 4012
[15:09:46] [Render thread/WARN]: Registry minecraft:item: Object did not get ID it asked for. Name: camera:album Expected: 2937 Got: 4013
[15:09:46] [Render thread/WARN]: Registry minecraft:sound_event: Object did not get ID it asked for. Name: camera:take_image Expected: 1436 Got: 1496
[15:09:46] [Render thread/WARN]: Registry minecraft:entity_type: Object did not get ID it asked for. Name: camera:image_frame Expected: 216 Got: 235

and

[15:10:01] [Server thread/WARN]: Incorrect key camera was corrected from null to its default, SimpleCommentedConfig:{}.
[15:10:01] [Server thread/WARN]: Incorrect key camera.cooldown was corrected from null to its default, 5000.
[15:10:01] [Server thread/WARN]: Incorrect key camera.consumed_item was corrected from null to its default, SimpleCommentedConfig:{}.
[15:10:01] [Server thread/WARN]: Incorrect key camera.consumed_item.item was corrected from null to its default, #camera:image_paper.
[15:10:01] [Server thread/WARN]: Incorrect key camera.consumed_item.amount was corrected from null to its default, 1.
[15:10:01] [Server thread/WARN]: Incorrect key image was corrected from null to its default, SimpleCommentedConfig:{}.
[15:10:01] [Server thread/WARN]: Incorrect key image.max_size was corrected from null to its default, 200000.
[15:10:01] [Server thread/WARN]: Incorrect key image.compression was corrected from null to its default, 0.5.
[15:10:01] [Server thread/WARN]: Incorrect key image.allow_upload was corrected from null to its default, true.
[15:10:01] [Server thread/WARN]: Incorrect key image_frame was corrected from null to its default, SimpleCommentedConfig:{}.
[15:10:01] [Server thread/WARN]: Incorrect key image_frame.only_owner_modify was corrected from null to its default, false.
[15:10:01] [Server thread/WARN]: Incorrect key advanced_data was corrected from null to its default, SimpleCommentedConfig:{}.
[15:10:01] [Server thread/WARN]: Incorrect key advanced_data.enable was corrected from null to its default, false.
[15:10:01] [Server thread/WARN]: Incorrect key advanced_data.max_entities was corrected from null to its default, 16.

Could that be the issue, why I just saw a black image
Thanks for your help.

PS: When you are German, you can write me in German, i am a German too. I just saw it when I clicked on your profile

Sorry i clicked the wrong button

This sounds like a corrupt world or a problem with upgrading a forge world to a newer minecraft version.
This is not a bug with the mod.