One big issue I have with VPN's and the various services as well is they usually keep logs of your traffic. Pretty hard pressed to find ones that don't do this any more. That being said on the flipside you have to deal with the issue you're bringing up with potential ip leaks. At least it's just an IP and not more track-able info. I'd reconmend to anyone worried about their VPN to research it more thoroughly moving forward if you're that worried about IP leaks.
Also if you're wondering if your data or username has been comprised (not just your ip) check this website https://haveibeenpwned.com/
Search for your common usernames, emails, etc and see if your data has been leaked anywhere or been breached without your knowledge / consent. Quick edit:
Really good link from the article that tracks all the currently "leaking" VPNs: https://docs.google.com/spreadsheets/d/1Nm7mxfFvmdn-3Az-BtE5O0BIdbJiIAWUnkoAF_v_0ug/htmlview?sle=true#gid=0