On my M1 mac, when I run impeller_unittests from a host_debug build, I hit metal validation errors on a few unit tests of blur coverage. They look like this:

$ flutter/testing/run_tests.py --quiet --type engine --variant host_debug --engine-filter impeller_unittests --engine-capture-core-dump
...
[ RUN      ] Play/DirectionalGaussianBlurFilterContentsTest.RenderCoverageMatchesGetCoverage/Metal
-[MTLDebugRenderCommandEncoder setFragmentTexture:atIndex:]:2528: failed assertion `Set Fragment Buffers Validation
texture is Memoryless, and cannot be assigned.
'

I'm guessing the test is passing on CI and failing locally because these tests are pinned to an intel machine on CI.

These tests might have been affected by recent changes in this area like flutter/engine#47576, and flutter/engine#48149, but may also have been hitting validation errors before those changes?