AttributeError: 'DataArray' object has no attribute 'values'

When hitting `/WebMercatorQuad/map.html?backend=xarray&concept_id=C3294057315-ASF&datetime=2025-11-03T00:00:00Z&variable=displacement&colormap_name=terrain&rescale=-0.1,0.05`, I noticed the following error appear in the logs.

When I zoom in close enough to the Santa Cruz, CA area to see some tiles, it seems okey, but when I then zoom out just a bit, that seems to trigger this error.

```plain
tiler-cmr | INFO: 192.168.65.1:21242 - "GET /tiles/WebMercatorQuad/8/40/100%401x?backend=xarray&concept_id=C3294057315-ASF&datetime=2025-11-03T00%3A00%3A00Z&variable=displacement&colormap_name=terrain&rescale=-0.1%2C0.05 HTTP/1.1" 500 Internal Server Error
tiler-cmr | ERROR: Exception in ASGI application
tiler-cmr | Traceback (most recent call last):
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi
tiler-cmr | result = await app( # type: ignore[func-returns-value]
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
tiler-cmr | return await self.app(scope, receive, send)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/fastapi/applications.py", line 1135, in __call__
tiler-cmr | await super().__call__(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/applications.py", line 107, in __call__
tiler-cmr | await self.middleware_stack(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
tiler-cmr | raise exc
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
tiler-cmr | await self.app(scope, receive, _send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/titiler/core/middleware.py", line 153, in __call__
tiler-cmr | raise exception
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/titiler/core/middleware.py", line 139, in __call__
tiler-cmr | await self.app(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/titiler/core/middleware.py", line 57, in __call__
tiler-cmr | await self.app(scope, receive, send_wrapper)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/middleware/cors.py", line 85, in __call__
tiler-cmr | await self.app(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 63, in __call__
tiler-cmr | await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
tiler-cmr | raise exc
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
tiler-cmr | await app(scope, receive, sender)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
tiler-cmr | await self.app(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/routing.py", line 716, in __call__
tiler-cmr | await self.middleware_stack(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/routing.py", line 736, in app
tiler-cmr | await route.handle(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/routing.py", line 290, in handle
tiler-cmr | await self.app(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/fastapi/routing.py", line 115, in app
tiler-cmr | await wrap_app_handling_exceptions(app, request)(scope, receive, send)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
tiler-cmr | raise exc
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
tiler-cmr | await app(scope, receive, sender)
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/fastapi/routing.py", line 101, in app
tiler-cmr | response = await f(request)
tiler-cmr | ^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/fastapi/routing.py", line 355, in app
tiler-cmr | raw_response = await run_endpoint_function(
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/fastapi/routing.py", line 245, in run_endpoint_function
tiler-cmr | return await run_in_threadpool(dependant.call, **values)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/starlette/concurrency.py", line 32, in run_in_threadpool
tiler-cmr | return await anyio.to_thread.run_sync(func)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/anyio/to_thread.py", line 56, in run_sync
tiler-cmr | return await get_async_backend().run_sync_in_worker_thread(
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 2441, in run_sync_in_worker_thread
tiler-cmr | return await future
tiler-cmr | ^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 943, in run
tiler-cmr | result = context.run(func, *args)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/titiler/cmr/factory.py", line 606, in tiles_endpoint
tiler-cmr | image, _ = src_dst.tile(
tiler-cmr | ^^^^^^^^^^^^^
tiler-cmr | File "/app/titiler/cmr/backend.py", line 360, in tile
tiler-cmr | return mosaic_reader(mosaic_assets, _reader, tile_x, tile_y, tile_z, **kwargs)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/rio_tiler/mosaic/reader.py", line 89, in mosaic_reader
tiler-cmr | for img, asset in filter_tasks(
tiler-cmr | ^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/rio_tiler/tasks.py", line 34, in filter_tasks
tiler-cmr | yield future.result(), asset
tiler-cmr | ^^^^^^^^^^^^^^^
tiler-cmr | File "/usr/local/lib/python3.12/concurrent/futures/_base.py", line 449, in result
tiler-cmr | return self.__get_result()
tiler-cmr | ^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/usr/local/lib/python3.12/concurrent/futures/_base.py", line 401, in __get_result
tiler-cmr | raise self._exception
tiler-cmr | File "/usr/local/lib/python3.12/concurrent/futures/thread.py", line 59, in run
tiler-cmr | result = self.fn(*self.args, **self.kwargs)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/titiler/cmr/backend.py", line 344, in _reader
tiler-cmr | return src_dst.tile(x, y, z, **kwargs)
tiler-cmr | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/rio_tiler/io/xarray.py", line 285, in tile
tiler-cmr | da = da.rio.reproject(
tiler-cmr | ^^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/rioxarray/raster_array.py", line 471, in reproject
tiler-cmr | source=self._obj.values,
tiler-cmr | ^^^^^^^^^^^^^^^^
tiler-cmr | File "/app/.venv/lib/python3.12/site-packages/xarray/core/common.py", line 300, in __getattr__
tiler-cmr | raise AttributeError(
tiler-cmr | AttributeError: 'DataArray' object has no attribute 'values'
```

Reproduce the WebMercatorQuad request while zooming out, then trace the failure from titiler/cmr/factory.py:tiles_endpoint through titiler/cmr/backend.py:tile and _reader. Compare the xarray tile path with the rioxarray reproject call shown in the traceback; done means the request no longer returns HTTP 500 for this case.

Written by the indexing model from the issue text.