i too have noticed these same glitches actually. alongside if you use a shape around the chassis for example making a fullbody horizontal or drum spinner[like Axe Backwards from Battlebots] then the bots takes NO damage from sources. only the chassis piece is where the damage is dealt. another 2 common glitches in-game lately are when a horizontal spinner hits a vertical spinner thats pinned in a corner or such, both bots get sent FLYING spazzing and die instantly, while another glitch is that some bots when pinned on a wall just randomly despawn.
A feature i hope to see in the future [unsure how hard itd be to code D:] is that when hit in certain places with DoT, parts and bits would get beaten off, such as busting a wedge off a bot.