The AutoFill app on iOS has a memory limit of 120 MB. As a result, you may need to set the Argon2id memory requirement to a value significantly less than 120 MB.
You can confirm whether this was the cause of the problem by switching back to PBKDF2. If the problems disappear, then you’ll know that Argon2id caused the problem. You could then go back to Argon2id if you want, but adjust the memory setting to a lower value.