For me the issue is reproducible when I am traveling exactly at (90.0/y) in the F3 display on a multiplayer server in the nether at y=32. the moment I am not traveling at 90.0 the glitch stops, and when I enter 90.0 my fov toggles and I travel at walking pace. the only way I have found to move at sprinting speed while holding the 90.0 heading is to strafe left and right.
Pamone Brewshire
For me the issue is reproducible when I am traveling exactly at (90.0/y) in the F3 display on a multiplayer server in the nether at y=32. the moment I am not traveling at 90.0 the glitch stops, and when I enter 90.0 my fov toggles and I travel at walking pace. the only way I have found to move at sprinting speed while holding the 90.0 heading is to strafe left and right.
Minecraft 1.13.1
Java:1.9.0_51 64bit
CPU: 8x Intel(R) Kenor (R) CP E3-1241 v3 @ 3.5GHz
Display: 1600:900 (NVIDIA Corporation) GeForce GT 740/PCIe/SE2 4.6.0 NVIDIA 388.13