Affects Version/s: Minecraft 1.13.2, Minecraft 19w02a, Minecraft 19w03a, Minecraft 19w03b, Minecraft 19w03c, Minecraft 19w04b, Minecraft 19w05a, Minecraft 19w06a, Minecraft 19w07a, Minecraft 19w12b, Minecraft 19w13b, 1.14.4, 19w40a, 1.15 Pre-release 1, 1.15 Pre-Release 2, 1.15.2 Pre-Release 1, 1.15.2, 20w06a, 20w09a, 20w12a, 20w13a, 20w13b, 20w14a, 20w17a, 20w19a
Fix Version/s: None
In 19w02a, this doesn't seem to happen in EW-direction when there are only 2 unridden minecarts on the railway, but it always happens when there are 3 carts on the track (have to conduct more tests to be 100% sure about it not happening with 2 unmanned carts in EW).
If one of the two carts is ridden by an entity, the sticking-together already happens with only 2 carts on the track.
In 1.13.2, it seems to also happen in railways EW-direction, as well as on railways in SN-direction, too. More test details and potential differences between 1.13.2 and the current 1.14 snapshot asap, needs more testing overall.
Stuck carts can result in getting stuck - at least in narrow railway curves. Resulting in them being also pushable outside of the railway, and continuing momentum (MC-14)
Stuck carts can also result that they will not be able to take a curve, they will be going back and forth on one railway line
Maybe this bug got caused due to a fix of
The timing - 1.13.2 - would fit, and also reopening of MC-14 in 1.13.2; on first glance I couldn't find other fixed bugposts in that time period where this bug here could have been caused by.