MTR 4 is still in active development, and there are some issues and features to be completed.

You can help the development of MTR 4 by contributing to such area.

• Train will not render with Sodium in MC 1.19.4 (Or Rubidium on MC Forge 1.20.1, switch to Embeddium in this case)
• BVE Sound will no longer be able to play if the sound hasn't been played for 20 client ticks (Whether due to lag or other reasons)
  • Reinstating the train (Going out and back in the area) would fix the issue, but F3+T does not fix it.
• Vehicle Sounds are played multiple times when using shaders (Tested with Iris 1.7.2+mc1.20.4)
• Custom destination for trains does not work reliably.
  • Cannot find a way to reproduce reliably yet other than specific routes in a migrated world
  • Train's custom destination are displaying the custom destination from the furthest custom destination in specific route
  • Example: A route running from A to D.
    • If C has a custom destination, then train will always show C's destination even before reaching C
    • If D has a custom destination as well, then train will always show D's destination even before reaching D
• Migration: NTE Rail flipped to the other side after upgrading to MTR 4.
• Vehicle sounds cannot be overriden with BVE Sounds on custom trains with base_train_type.
• Train always open door when stopped with PSD/Platform block, even if it's not a stop in the route (Boardable)
• F3+T when riding a train will kick the player with Invalid move player packet received (Can repo in Singleplayer)
• Train bogie will disappear/appear in wrong position when riding train
• The resource pack creator cannot use non-alphanumeric characters such as CJK, and characters are garbled when exported.
• Clearing a depot's vehicle while onboard the train will cause the train to continue persist until the player gets off
• Dynamic Texture generation could potentially fail? (java.lang.NullPointerException: Cannot invoke “java.awt.Font.deriveFont(int, float)” because “this.font” is null)

• Train announcement still gets played even when in-game sound volume is 0
• The model of the player riding train would shake, while the train render smoothly.

• MTR 4 will significantly raise the temperature of some CPU Model causing a bottleneck
• Sometimes certain train will be completely silent?
• Solid color displayed for route map in terminating platforms/platforms without route. (Reproduced with Tianjin Metro Addon, haven't tried reproducing without it installed)

• Re-implement Manual driving
• Hide Route not working on System Map
• Missing Ding Sound in Elevator
• Single Arrival Vertical PIDS not implemented

Some of the known problematic shaders are listed below (MTR 4.0.0 beta.13):

Some custom door sound does not get played for whatever reason, to be investigated