Indesign doesn't correctly display zero ink levels when inspecting psd files with the ink limit inspector when the .psd file has the default 'background' bottom layer present.

first image uploaded shows two files with same colour profiles, from same scanner etc previewed in Indesign —top one still has a 'background' base layer and the white area around it shows red when there isnt any ink/colour — this is incorrect!

If I double click the background layer so it is no longer 'flat' and resave the top photoshop file, then Indesign is able to read the ink levels correctly!

See second screenshot

Please refer to this community support post: https://community.adobe.com/t5/indesign-discussions/ink-limit-bug-in-new-indesign-18-5/m-p/14133108