The default for UseStringArrayForQueryOptionsSchema should be false

[baywet]

OpenAPI.NET.OData/src/Microsoft.OpenApi.OData.Reader/OpenApiConvertSettings.cs

Line 334 in 087438b

public bool UseStringArrayForQueryOptionsSchema { get; set; } = true;

Added in #499

Setting the default to true effectively changed every conversion from emitting array of enum values to arrays of strings silently.
This is a strong behaviour change, and the default should have been false.