Trezor forgets the ERC 20 token that I add manually

I manually add ERC20 tokens to the ETH wallet. They appear and I can see my balance. When I disconnect my wallet for a short while and then reconnect the tokens are no longer listed and I have to add them manually again. Am I missing a step where I have to save the tokens that I add manually?

If the balance is zero then the ERC-20 token will disappear from Trezor Suite when you disconnect your device. This is standard functionality, as Suite thinks it’s not important to remember unused tokens. You’ll have to transfer some tokens to it before Suite remembers it between sessions.

However, if the balance is not zero the token(s) should not disappear from view.