minecart flotation

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
For technical support please use the Mojang Support Center.

-- I am a bot. This action was performed automagically!

Invalid. You are using an unsupported version (1.13-pre2). Please update to the latest snapshot (1.13-pre5) and see if the issue persists. Don't put false versions under the affects versions list.

o it in pre 5 i had no crash yet