MMBasic keyboard input is corrupt

As pointed out here:
https://forum.clockworkpi.com/t/del-key-problem-solved/17049/26

Using a single input command…

```
Input "Time"; t$
time$=t$
```

Typing 23:33:45
You get “Error : Expected closing bracket”…    (from the time$=t$ assignment)
If you print t$ you get ``23@:33@:45``

The extra "@" character is being saved when the ":" key is pressed.