Steps to replicate the issue (include links if applicable):
What happens?:
Sometimes the first argument shows a type, but no reference field to enter the key reference.
What should have happened instead?:
The reference field should have been displayed.
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
Sometimes it gets displayed when I reload.
When I am in a composition, trying to use value by key, I can sometimes switch the function and then back to value by key and then it loads fine.
It is not completely deterministic.