Why every TOTP app default uses SHA-1 hash encryption?

I use Aegis as my 2fa. Today on new token creation I observed that there's hash function set to SHA-1, later checked all my tokens and the result is same type of encryption used for all. So I have edited all my tokens to SHA-256 as a result my totp doesn't authenticate. Do I have to rescan my tokens for updating to SHA-256 or...