We have a TSAN suppression for WiredTiger, which as of SERVER-78018 is done by specifying called_from_lib:libwiredtiger.so. However WT may call into another library (zstd for example) which then performs the write. Since the called_from_lib suppression only cares about the library that actually performed the write (ignoring anything further up the stack), it does not get suppressed in this case.