The project seems to be using the third party Bakery lightmapper. We cannot provide much support for using Bakery, as it is not developed by Unity. If you need additional support for this asset, contact the developer.

Bakery takes full control over the lightmapping pipeline, including runtime loading of lightmaps, and should not be used together with Unity's built-in lightmapper. It seems this has happened in your project, as the problematic scenes has 2 sets of baked data on disk: One produced by bakery, and one produced by the built-in lightmapper.

If you intend to use the built-in lightmapper for this scene, clear the data Bakery has generated. There seems to be a dedicated button for this under Bakery -> Utilities -> Clear baked data. Alternatively, uninstall Bakery. Doing either of these should cause lightmaps generated by the built-in lightmapper to work again. When you want to bake again, you should use the button at Window -> Rendering -> Lighting -> Generate Lighting.

If you intend to use Bakery, you should clear the data generated by the built-in lightmapper. This can be done via Window -> Rendering -> Lighting -> Clear Baked Data under the dropdown on the Generate Lighting button. Bakery has its own window for doing bakes - you should use that instead of the lighting window.