Howdy!
I checked and could not find anywhere that had already reported/posted this issues so I thought I'd bring it up. In SB the new(ish) ClearLag alerts and timed entity removal process works great except it's been also removing non-rideable minecarts! Its not a huge huge issue but I know I personally used to use chest minecarts and hopper minecarts for my redstone contraptions and storage systems which are now broken (and redesigned with hoppers >.
Thank you,
DrakeDarkfire