As a workaround to remove tiles, you could switching to "Tiles" or "Materials" and remove them there with RMB.
However removing tiles in this way does not correct tilemap connections and you need to correct them manually.
- https://github.com/pkhead/rained/issues/18
I have fixed the issue where tiles could not be removed in autotile mode, but it does not automatically correct connections.
I have fixed the issue where tiles could not be removed in autotile mode, but it does not automatically correct connections.