I commented to the same effect on reddit: This doesn't ring true to me at all.
The numbers have the same animation, but it's both shorter and interruptible, so the people who built the app seem perfectly aware of the problem and how to "fix it".
This seems deliberate, as if somebody figured that, while it's a legitimate use case to rapidly tap digits to input a longer number, tapping an operator multiple times is likelier to be an input error, so they purposefully block it. Clearly a mis-feature, but a feature nonetheless, rather than a bug.
The numbers have the same animation, but it's both shorter and interruptible, so the people who built the app seem perfectly aware of the problem and how to "fix it".
This seems deliberate, as if somebody figured that, while it's a legitimate use case to rapidly tap digits to input a longer number, tapping an operator multiple times is likelier to be an input error, so they purposefully block it. Clearly a mis-feature, but a feature nonetheless, rather than a bug.