You could try pulling out the switch and seeing if something got stuck or damaged. Switches are relatively inexpensive so you could just replace it. They're very, very easy to replace. You could also take this as an opportunity to try out other switches. That's what I did when I damaged some with a soda.
I picked up these and love them https://www.amazon.com/dp/B07ZFDP5RV/ref=cm_sw_r_cp_apa_i_NwCsFbSS8CDSZ
If you haven't bought your koalas yet, I found some on amazon if you want check them out. You will have to pay a premium for them though.
They literally just restocked on Amazon.
I think you can get Koala switches on Amazon!