Click on Print Button Triggers a TiddlyWiki Save on Single File Version

Is this feature or a bug?

In single-file TiddlyWiki (not Node.js), I added the Print button to the page controls. When I click the Print button to print tiddlers opened in the story river, dirty state turns red, and the Saved wiki notification appears. Strangely, nothing is actually saved. If the dirty state is already red, no notification appears.

I have Timimi installed, so I assume it activates save action (an notification then appears), but why should printing alter dirty state to red?

That’s probably a Timimi thing

The changing the dirty status from grey to red (saved wiki to unsaaved wiki) appears on TiddlyWiki 5.3.6 empty.html

My question is what, click on print button changed the dirty status? Is this normal?