I have tested this 3 times to confirm that minecarts on the game refuse to take corners. To execute the issue, place a rail on a turn of any angle. Place a minecart and push it. As said, you can see the rail doesn't make the corner, rather it comes off the rail or twitches but doesn't make the corner. I made sure to check that there was an issue already made but I have not double checked. Thanks for your time!
Environment
The following info is from a laptop
Graphics: Intel HD Graphics 4.0.0 Build-10.18.10.4885
Minecraft snapshot:19w09a
CPU: Intel(R) Pentium(R) CPU N3540 @ 2.16 GHz
Memory: Running at Xmx 2g; 4.0Gigs
i found the same glitch, and i tested it with all the type's of minecarts there are and wen you forse push them they just shoot out of the rail.