ROCKLIN, Calif. – A California first grader was investigated by school officials after she unintentionally “mis-gendered” a classmate on the playground, and the girl’s parents aren’t too happy about it.

The incident at Rocklin Academy follows parental outrage earlier this summer over a kindergarten teacher who gave a lesson to students about transgenderism without first alerting parents.

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The classroom lesson involved the teacher reading students two books on the subject, and included a student who changed into different clothes to reveal their “true gender,” CBS Sacramento reports.

Parents were enraged that they were not given an opportunity to opt their 5-year-olds out of the transgender lesson, though school officials insisted they’re not required to give advance notice of such controversial lessons.

Several weeks later, the schools policies for transgender students are again causing controversy after school leaders took action against a first-grader who did not call her transgendered classmate by the proper pronoun, Fox News’ Todd Starnes reports.

The latest incident occurred on the playground when a young girl called her classmate by his given name, apparently unaware of the tike’s new gender identity.

“This innocent little first grader sees a classmate, calls him by the name she knew him last year and the boy reports it to a teacher,” according to Karen England, spokeswoman for the Capitol Resource Institute, which is working with several parents concerned about transgender issues at Rocklin Academy.

“The little girl gets in trouble on the playground and then gets called out of class to the principal’s office,” England told Starnes.

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England said the first-grader was investigated by the principal for about an hour to ensure the child was not intentionally bullying the transgender student, and was eventually released without punishment.

England said the young girl was traumatized by the experience.

“The daughter came home from school upset and crying – saying, ‘Mommy, I got in trouble at school today,’” she said.

When girl’s mother contacted school officials to understand what happened, she was told her daughter was involved in a “pronoun mishap” that required a school investigation.

“She was told that whenever there is a pronoun mishap with this biological boy who now claims to be a girl – the school must investigate,” England said.

The mother also wrote a letter to vent her frustrations with the situation.

“I stressed over and over with the principal that I am all for protecting the rights of (the transgender child), but my children have rights as well,” the mother wrote. “It makes me sad that my daughter felt like she was punished for trying to be kind to the kid.”

Starnes noted that the religious liberty law firm Alliance Defending Freedom is now looking into the playground incident, as well as the kindergarten classroom lesson on transgenderism.

“Our focus is on ensuring that every student’s privacy is protected and that parental rights, including the right to be notified … before children are exposed to gender identity teaching, are respected by school officials,” and ADF spokesman told Starnes.

Rocklin Academy officials, meanwhile, haven’t bothered to respond to repeated requests for comment.