[Dev-luatex] Problem with directlua and synctex_tag

We can use ``` \directlua{tex.set_synctex_tag(421)} \directlua{print('421=',tex.get_synctex_tag())} \bye ``` To set and read the synctex tag. But if we wrap this into a macro, things get broken and the synctex tag is not changed. ``` \def\test{\directlua{tex.set_synctex_tag(421)}} \test \directlua{print('421=',tex.get_synctex_tag())} \bye ``` For synctex_line there is no such problem. Is this a bug or a feature ?