Some cross models have Z-fighting with their old models

In the 1.21.70.20 preview, it appears several more cross models have been fixed to be mirrored correctly. However, several of them now have Z-fighting between their old and new models. This includes:

• Crimson and warped fungi
• Nether sprouts
• All potted plants except for mangrove propagules (still mirrored incorrectly), cactus, eyeblossoms, and bamboo