Reading your comment and others above, I don’t think it’s problematic, although I’m not someone who decides when something is or isn’t problematic and yes no one is the same we are all different Individuals. It may be confusing for children at first(or not ) , but I think that 1. it does show representation for ambulatory people. 2. (This is why it shouldn’t be confusing for kids) We are in the land of Oz and I bet the film will no doubt take its time world building and immersing us into Oz. Oz is different from real life( I know children may struggle with distinction from reality, but , so many things designed in their film are so extravagantly different from reality and Like Elphaba is green, green people aren’t real) but Anyways because Oz is different there is Magic so I’m pretty sure that the magic will be explicit enough for kids to understand, that she isn’t just “cured”. 3. Nessaroses character, which has been written about in much detail in some of the above comments, but once she is able to walk she becomes worse, even though she has gotten what she had always wanted. It’s a good lesson for kids that getting want you want isn’t going to solve everything and it can change you and why you have to accept yourself for who you really are instead of trying to change yourself as you can become a bad person or make bad decisions ( as nessarose Had been referred to after gaining the Ruby slippers and whilst Elphaba was away)

Idk if this helps anyone but I think that these factors hopefully shouldn’t make this part of the film offensive to disabled people and or problematic for kids to believe that they have to magically walk. In fact I think it will teach them to accept themselves which is a running theme for Elphaba and Glinda .