buttons, pressure plates, redstone dust, levers and rails act like blue ice for boats. but you have to start on blue ice to see the glitch

This is patched in 1.16.0.51 beta.

• Boats no longer continue sliding on bottom half slab

Resolving issues that were marked as fixed in the 1.15 and 1.16 Betas, now that 1.16.0 is being released.