The armor of the wither when at half health doesn't render transparent objects behind it. This happens on all graphics settings, including fabulous.
Command to reproduce
/summon minecraft:wither ~ ~ ~ {Health:1f,NoAI:1b,Silent:1b}
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Fancy settings. AMD Ryzen 7 2700Z Eight-Core Processor

Please force a crash by pressing F3 + C
for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
Also please check if the issue happens on fabulous.

Yes also happens on fabulous

And on fast

Hey, reporter! Can you reproduce this bug in 1.15.2?

Can confirm in 1.15.2
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w13a.
Can confirm in 1.17.1.

Entities and entity-rendered blocks are also affected - should this be reported separately?
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Can confirm in 1.18.2 and 22w12a. You can use the following command in order to more easily reproduce this issue.
/summon minecraft:wither ~ ~ ~ {Health:1f,NoAI:1b,Silent:1b}
Can confirm in 1.19 and 1.19.1 Pre-release 1.
Can confirm in 1.19.2.
What graphics setting do you use (fancy, fast, fabulous)? Also, what are your system specs?