Whole note bug

1. Start with an empty piece in 4/4
2. Click on the first rest.
3. Press N to enter note entry mode.
4. Hit "7" for whole note.
5. Hit "A" or whatever note.

You get a whole note.

See:
https://musescore.org/en/handbook/3/note-input#basic-note-entry

After creating a new score (and before entering any notes) there are full measure rests in the score, regardless of the time signature, see: https://musescore.org/en/handbook/3/measure-rests#full-measure-rest.

To be clear:

You are always supposed to enter note input mode before entering notes. And you need to select the intended duration after entering note input mode. Selecting a duration while not in note input mode does something else entirely - it changes the duration of whatever you have currently selected.

So: in normal mode, durations change the selected note. In note input mode, durations tell MsueScore what to do next.