Self Checking Tables

In my activity, I want to have multiple cells in a table to be checked and if correct they get a checkmark. I used this activity last year with no problems and this year they do not get the checkbox. What do I need to change for my code?

https://teacher.desmos.com/activitybuilder/custom/652f096e55ef993fab7e3f14

Maybe you changed something because it works just fine for me …
I noticed a typo in slide 3:

correct:this.cellContent(8,1)=“:white_check_mark:” and this.cellContent(8,2)=“:white_check_mark:
should be
correct:this.cellContent(4,2)=“:white_check_mark:” and this.cellContent(8,2)=“:white_check_mark:

I’m having trouble with a similar table issue. We think it’s the angle and congruence symbols. Were you able to fix this issue? It looks like you worked around the problem by putting the symbols in the row header instead of in the answer cell.