The fix to MC-181566 appears to have made redstone dust start using 32-bit floats for creating particles, which causes them to appear at the wrong positions when far from spawn e.g. 20 million blocks out.
This is best tested when greater than 16,777,216 blocks out on both axes, so being 20 million blocks out should suffice. This issue is without a doubt due to incorrectly casting to a 32-bit float from an integer or double, resulting in numerical precision being lost. This can be fixed by simply not casting to a float, which eliminates any chance of losing any precision.
Related tickets: MC-182789
Linked issues
relates to 15
MC-167103
Casting issue: Mob spawning loses precision at high coordinates
Resolved
MC-161969
Casting issue: Adding ender eyes to end portal frames at high distances causes particles to lose precision
Resolved
MC-164352
Casting issue: Snow animation becomes stretched when being very high above the ground
Open
MC-167046
Casting issue: Lava ember particles and lava popping sounds lose precision on creation at high coordinates
Resolved
MC-167047
Casting issue: TNT blocks ignited by other explosions lose precision at high coordinates
Resolved
10 more links
Please remove the relates to for MC-76810