offine table designer - index and table in different file scenario is broken

[alanrenmsft]

Create a new sql project with a table in one file and an index for that table in a different file
Open table designer for the table
Update the index by changing the column
Publish and verify that the index in the other file was updated and not added to the table's file

actual:
the file with index is deleted.

[kisantia]

I tried this on both mac and windows and wasn't able to repro:

[alanrenmsft]

not able to reproduce with latest insider