URGENT! 请问皮匠和小白兔~ EAD可以打二份工嗎?

I am waiting for I-485 and used AC-21 to change the job. So, I am using EAD card for a full time job.
Recently, I get another part time job for weekend. Can I use EAD card to work for both jobs? Will it be an issue for my I-485 application?

Thank you for your suggestion!