I have never autorotated blocks, but there's always a first time. What does your help section say about annotative text and annotative blocks?
Here's a bit of info you might not know. If you haven't set your CANNOSCALE in modelspace it will be 1:1 and that is the scale any annotative block will attempt to insert at. I set mine to 1/4" = 1'-0". I also create blocks such as a light switch or wall outlet receptacle in paperspace, at the size I wish the plotted sheet to show them. When they are made annotative they adopt the 1:1 scale as the one they were created at, but when I insert them in modelspace they adopt the current CANNOSCALE (1/4"). Now the same block can go in a legend and on the model. I believe you have to set the list of scales you wish the block to be visible at for any other scaled viewports. I think there's also a setting to make the blocks automatically adjust to new viewport scales.
I hope my info was useful, but if by some odd chance it actually solved your issue, feel free to mark your post as "Accept as Solution". Thanks! 🙂