No header output in RollingRandomAccessFile

...
162:                return new RollingRandomAccessFileManager(raf, name, data.pattern, +new DummyOutputStream()+, data.append,
163:                        data.immediateFlush, size, time, data.policy, data.strategy, data.advertiseURI, data.layout);

35:    protected OutputStreamManager(final OutputStream os, final String streamName, final Layout<?> layout) {
36:        super(streamName);
37:        this.os = os;
38:        if (layout != null) {
39:            this.footer = layout.getFooter();
40:            this.header = layout.getHeader();
41:            if (this.header != null) {
42:                try {
43:!!!                 this.os.write(header, 0, header.length);
44:                } catch (final IOException ioe) {
45:                    LOGGER.error("Unable to write header", ioe);
46:                }
47:            }
48:        } else {
49:            this.footer = null;
50:            this.header = null;
51:        }
52:    }

306:                os = new FileOutputStream(name, data.append);
307:                if (data.bufferedIO) {
308:                    os = new BufferedOutputStream(os);
309:                }
310:                final long time = file.lastModified(); // LOG4J2-531 create file first so time has valid value
311:                return new RollingFileManager(name, data.pattern, +os+, data.append, size, time, data.policy,
312:                    data.strategy, data.advertiseURI, data.layout);