Historically, texture presets have not been applied to lightmaps even though lightmaps are textures. A user reported this and after discussing the issue internally we decided that this was a real bug, so we fixed it in 6000.0.11f1.
This means that projects which have TextureImporter presets configured in PresetManager without a filter, will now have these presets applied to their generated lightmaps (because they are textures). The attached test repro falls into this category: The presets are applied to the generated lightmaps and this explains why type is set to Default.
If you do not want a particular preset to apply to lightmaps, you can use Preset Manager's Filter column to control which presets are applied to what.
This issue has recently been discussed on our forums as well: https://discussions.unity.com/t/significant-urp-lightmapping-apv-discrepancy-between-6000-0-11f1-vs-6000-0-3f1/1487591/13.