Boolean property "not used within component"

Hello,

I cannot play with boolean properties anymore.
Maybe something has recently been updated and I’m not familiar with the new UI or maybe something is buggy on my end, whichever way, could you please have a look at the attached test file and help me figure out what is happening ?

Upon creating a component with two variants, I add a boolean property, which immediately indicates on the component property panel that it is “not used within component”. I then head to each variant, one after another, in an attempt to specify whether the new property should be True or False, however it does not appear in their property panel.

Alternatively, I have looked for the “Apply variable” button in the variants Appearance panel, but the button doesn’t show.

This is creating major delays in a prototype I am preparing for a client, so any help will be appreciated.

Bets regards,
Baptiste