Certain chunk loading errors are not logged

private Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure> handleChunkLoadFailure(Throwable throwable, ChunkPos chunkPos) { // In ChunkMap.java
    if (throwable instanceof ReportedException reportedException) {
        Throwable throwable2 = reportedException.getCause();
        if (!(throwable2 instanceof IOException)) {
            this.markPositionReplaceable(chunkPos);
            throw reportedException;
        }

        LOGGER.error("Couldn't load chunk {}", chunkPos, throwable2);
    } else if (throwable instanceof IOException) {
        LOGGER.error("Couldn't load chunk {}", chunkPos, throwable);
    }

    return Either.left(this.createEmptyChunk(chunkPos));
}

(From ChunkMap.java)

If the error is not IOException, it is simply ignored. Errors converting chunks using DFU fall into the ignored category here.

The exception should be logged as long as it's not ThreadDeath. ThreadDeath should be re-thrown, however that's impossible when using CompletableFuture.