Any attempt to run a /particle dust command with the size modifier set to anything less than 0.2 will immediately crash the game. I specifically tested several values from 2 to 0.2 and they all worked, but 0.1 and 0 crashed. The crash occurs in both the chat and command blocks. I did not find this issue with any other particle. No lasting issues seemed to arise.

The crash message was "The game crashed whilst ticking particle Error: java.lang.ArithmeticException: / by zero"