nope you can change it without any problem
I changed mine n it did nothing
your account is your account. what changes the account is if you go up and say "create a new account" altering your email or pw does not change your lists. right now though with the glitch going on, you're just going to have to wait for them to come back. they are manually being fixed. keep up with the info going on here https://www.mangago.me/home/mangatopic/21107997/ and suggestions you can do while you wait if you want
If i change my 3mail, does it reset the comics ive read??