When making an image full-bleed (fill), the button is not toggled
The button should show the current status
Status quo (see button on the right)

It should be marked "active" just like the alignment button here:

_Do not alter or remove anything below. The following sections will be managed by moderators only._
@swissspidy What about flip controls? Should they also reflect the status when selected?

@obetomuniz IIRC no. But I'll let @samitron7 confirm.
Pascal is correct. It is not a toggle.