Haven’t really used tagify enough to comment just remembered it had a min chars property, from the docs looks like it is supposed to show the drop-down even with the default option of 2 so could still be a bug but can’t confirm
I have used both setups, with min chars set to 0 and 2. When the min chars property is set to 0, the list appears when user clicks in the tagify input field. When the min chars is set to 2, the list appears after minimum 2 chars have been entered in the input field.
I have only seen Tagify list displaying after min chars have been entered where property is set to more than 0. I don’t know if this behaviour is supposed to be different for this type of setup.