UPDATE - 1.14.4 resolved the issue! My issue was the same as MC-154271 , which was fixed.
With 1.14.3 I'm getting horizontal artifacting when looking around or walking/running; whenever everything on screen is changing quickly. I do not experience this issue with previous versions of Minecraft and have not made any changes to video settings or otherwise.
(I would like to have attached a slightly longer video showing more of the issue but couldn't stay under the file size requirement.)
Environment
Minecraft Java
Java version 8 update 201 (Current)
Mac OS Mojave 10.14.5
Late 2013 iMac; Built-in 27" display; NVIDIA GeForce GT 755M 1 GB graphics
1.14.4 resolved the issue! I now know it as a "rolling shutter" issue and it did get fixed.