To reproduce, build the indicated variant on an M1 Mac:

et build -c host_debug_unopt_arm64

and then run the golden tests and at least one will fail with an assertion failure, such as:

[FATAL:flutter/impeller/entity/contents/content_context.cc(157)] Check failed: default_handle != nullptr.

You should be able to reliably use the GaussianBlurWithoutDecalSupport test to reproduce this with:

(cd <engine_src>out/host_debug_unopt_arm64; ./impeller_golden_tests --working_dir=<image_output_dir> --gtest_filter=Play/AiksTest.GaussianBlurWithoutDecalSupport/Metal)