SHOW_IF expression weirdness

I have a picking app
There is a SHOW_IF expression on columns [Serial Number 1], [Serial Number 2] etc.
ISNOTBLANK(SELECT(Product Serial Numbers[SerialNumber],[_THISROW].[Product Code 1]=[ProductCode]))
This checks of the product is in the Product Serial Numbers table and shows the ENUMLIST in the form if it is.
That is working ok.
But then the next view is a Detail View.
The [Serial Number…] columns are all showing in this view.
This started yesterday afternoon, it was working for a few months prior to this.

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