If you are looking for sticky post option in WordPress block editor(Gutenberg), It is hidden behind post status option.
Here are the steps to access and mark post sticky.
Step 1:- Open New/Edit post in the block editor.
Step 2:- Click on the “Post” in the settings sidebar as shown below

Step 3:- Click on the Status’s value(e.g. Draft/Published) as shown below (marked number 1)

It will open a open a popover as marked by number 2 in the image.
Step 4:- Check/tick the Sticky option and close it.
Step 5:- Publish/Update your post and you have Sticky post.
Now you won’t have to worry about the sticky situation of the sticky post in the WordPress block editor!
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