The bug
In every version up to 1.8, the jukebox message for when someone put in a disc had a rainbow transition that was smooth until it faded away. After 1.8 the jukebox message got a noticeably rough color change near the beginning of the animation. From inspection, it seems that the first color of the jukebox is "hanging" until it finally updates to continue the smooth transitioning.
How to reproduce
Observe the text color change of a disc in a jukebox in Minecraft 1.8 or older
Repeat in the newest versions
Linked issues
is duplicated by 1
Attachments
Comments 8
It would be silly to say that a TPS issue would cause this behavior. Seeing that you  don’t understand what I’m talking about so later today I will attach a video specifying this behavior.
Yes, can confirm, Matthew Hunter! You beat me again!
The rough transition is only at the beginning, so nothing is major about this bug though - it doesn't affect game play, but yes, it may need to be fixed.
Cannot reproduce in 1.13-pre6.
Perhaps your game cannot keep up with the normal game tick rate or the normal FPS rate. Try optimizing your Minecraft in order to fix this problem.
😃