HTupolev

Bummer about the crash. Considering the short span of time since the tire was installed, an installation problem is a likely culprit.

Long gashes in tubes are often the result of the tube being caught between the rim and the tire bead. It's a good idea to put a bit of air in a tube before installation so that it can roughly hold a shape as you go through the installation process.
After the tire is fully on the rim, prior to inflation, it's good to double-check that the tube is fully "within" the tire and not caught under the bead anywhere around the wheel.
After inflating the tire, it's good to check that it is seated evenly around the rim. Most tires have a "lip" that sits right above where the tire enters the rim, and this is a useful reference for checking proper seating:



If the "lip" is significantly higher in some areas than others, and especially if the lip dives below the top of the rim in places, this indicates that the bead is not sitting evenly around the rim. This can indicate a tube interfering with the tire bead, although it can also be caused by a poor match between rim and tire (which can also be dangerous if not addressed, especially in a tubeless setup where there's no inner tube to aid in tire bead retention).