I was testing out the banner pattern and immediately after placing it in the loom the game crashed giving me a null pointer exception while trying to render it, might be a forge thing since the last few updates weren't really stable? The version it happened on is 37.0.84 I will attach the crash log. Many apologies if it is a problem with my installation.
crash-2021-10-14_13.55.53-client.txt

definitely a forge issue. this should be reported to their repo.