Collapse: collapsed class not persistent

[lianee]

See this fiddle

the v-b-toggle directive sets the "collapsed" class of the button, that works well, click on the button and its title will change accordingly.

but... close the collapse, the title then correctly read "Open Collapse", then change the value in the input field... The "collapsed" class disappears, and the button now read "Close Collapse".

[lianee]

in fact, anything changing the class will rip the "collapsed" class
this time changing the variant prop of the button:
fiddle

[RomeroMsk]

I'm experiencing the same issue. The collapsed class is not added back after changing the :class prop of a toggling element.