Player will be hurt after clicking in his car, using his key(stick). It's likely that the player is asphyxiated in a block. Maybe this plugin has something incompatible with paperspigot?
server：paper-243，minecraft 1.14.4
plugin: carz-7.0, vault, protocollib (both the latest version), no other plugins

I've just tried the latest version of paper with the latest Carz snapshot and am unable to replicate this problem. Can you please try again and reopen the ticket if found?