@Burningstone, @tom_l
Your ‘workaround’ is the best of the options (given the ‘recommended’ format)
But I hate having to manage this in two locations (even though I can do it in the same package file) so I guess I’ll just rewrite the whole section back to old style and ‘hope’ they fix the entity id.
It’s lucky I only played with this in one experiment package (which has 37 such entities) rather than all 34 package files.
Thanks to all for your input, but I think this iteration is flawed.