Even the most basic JSON column formatter seems to make the Edit in Grid view search results list box render blank. I've tried using @currentField.lookupValue
as well as much more complicated formatters. The search box works and results actually return judging by the "onhover" effect in the list box. I can see lookup IDs but the values are blank.
JSON formatter:
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"txtContent": "[$HG_x0020_Test.lookupValue]",
"debugMode": true
}