Windows 10 Pro 1909 on Illustrator 25.0.1

Deselecting an object with a Freeform gradient applied causes the fill swatch to show a question mark. If an object is then drawn with that question mark in the fill, Illustrator reports the following error:

"Can't finish previewing. Could not complete the requested operation."

Here are the steps to recreate:

1. Draw rectangle with a fill but no stroke applied
2. Fill with any 4 point freeform gradient
3. Click away from rectangle
4. Observe the fill swatch now has a question mark
5. Draw another rectangle
6. Error message appears.

Incidentally. the appearance panel shows nothing applied to the fill and stroke when you click away from the rectangle, however a grey box 'style' is visible alongside the words No Selection - the grey effect appears visible once the file is saved and the ai file is previewed via Windows Explorer (see attached)

As soon as you apply a stroke to the rectangle, this behaviour is no longer observed.