@Chasity_Scoggins thanks for sharing your feedback with us and reporting this! Our team is aware of this issue and a fix has been deployed today. If it’s not available to you yet, it will be soon!
@Dita_Zaludova_Didi I just tested and I’m able to add tags in My Tasks when multi-selecting tasks. You need to first enable the Tags column in the Customize section and once the column is visible in your List view, you can multi-select your tasks > click to add a tag to one of the selected tasks and the tag you add will be automatically added to all selected tasks 
@Ledimeri_Borsa I believe this is still possible, see the gif below. Let me know if this is not what you are trying to see 
@Jason19 it’s not possible to revert this update but we’ll make sure to share your feedback and all the feedback shared in this thread with our product team so they can consider it when implement future updates in My Tasks. Thanks for taking the time to share your feedback with us!