The ocean modifier uses its Bake operator for both baking and freeing
the cache, based on the `free` operator property.
There are two bugs here:
1. The "Delete Bake" variant of the button was created using the
`WM_OP_EXEC_DEFAULT` operator context. This skips the `invoke`
callback which is crucial for setting the operator `modifier`
property. Without that the modifier will just exit early.
The "Bake" button is drawn using the `uiItemO` function which uses
the invoke context automatically, so it does not have this issue.
2. The `free` property is set for the "Delete Bake" variant, but was
never reset to its initial `false` value. The "Bake" variant has to
also set this property, otherwise it will always execute the "free"
code path.
Pull Request: https://projects.blender.org/blender/blender/pulls/123506
37e2a27bdd