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I'm curious - does it happen to other GT kids as well?

Yes!
I like to think that in grade 1 my DD's brain turned ON. She thought K was fun and entertaining, but when she hit 1st grade she was done with fun and ready for a challenge and would complain about how repetitive math was. Fact Families YUK!
Due to lengthily testing, she did not get into the advanced/GT classes until the end of grade 1, after she was moved into the program I saw a huge positive change in her attitude about school.

While you are waiting for acceleration, I would see if you meet with the teacher and set up some differentiation. Why can't he make his own Algebra problems on the back of the addition sheet, or change the problems to include negative numbers? Show her some of the work he is doing at home at fun smile
I wish you the very best of luck