I used to be able to type "/h2"+Enter to change a block to a heading 2.

Now when I do that, after /h I still have the headings listed, but when I add any number for the hierarchy level - i.e. 1, 2, 3, 4 - the top item becomes "create a page with title 'h2'". The item to change the block to a heading 2 is listed AFTER that.

Annoying to say the least. My muscle memory keeps creating pages with titles h2, h3 and h4 (I don't often use h1). And I keep deleting them.

Please fix this and in future avoid changing menu item order - Microsoft made a big mistake with menu's that changed order depending on what you used most often. They thought it was a helpful feature. It wasn't it. It messes with your spatial orientation and with selecting (menu) items key stroke sequences that have made it into your muscle memory.