Minecraft synchronization of client-side feels "off" after pausing and unpausing the game
I have demonstrated this in a video using a redstone loop, as you can see, after pausing and unpausing the redstone loop almost chokes and catches up with itself, almost as if it became unsynchronized during the pausing process.
Please check if that's still an issue for you in the latest 1.14.4 stable release or the latest 1.15 development snapshot.