Editing the "Mark as Done" icons breaks the JS.

I've been attempting to edit some of my templates so my theme can make use of Font Awesome 5 Pro. To that end, I tried changing the "fa-check-square-o" CSS class for the "Mark as Done" checkbox to "fa-check-square" so it would actually work with the FA5 icons. After doing this, the following error popped up whenever I attempt to doubleclick the "Mark as Done" text to change the resolved status of a thread.

Quote

The parameter “objectIDs” is missing or invalid.

I'm going to take a wild guess and say that the JS is probably linked to the fa-check-square-o and fa-square-o CSS classes - which, in all honesty, is pretty poor design since those classes are directly related to a third party asset (Font Awesome) and there really shouldn't be JavaScript in the software that relies on them to function properly.

I know this may not be so much a "bug" as it is a nitpick, but I just wanted to point it out anyways.