Text in document in Writer has started blinking. How do I stop that?

Text was entered and seemed fine, some 13K words over all. Then the whole document started to blink at about a once every 2 seconds rate. I tried deleting text from the end back towards the start of the document but removing eventually all the text and reentering some test text showed that the issue persists.

Hi

Unchek FormatCharacterFont Effects tab▸Blinking

This parameter can also be defined in styles: e.g. Right Click the text▸Edit Paragraph styleFont Effects tab▸Blinking

Regards

It’s a bug that has existed since 2015.