Well, if it was indeed that simple, the swap would have happened already.

There are so many angles at play in this world of pandemic, China and the US narrative, China and the Canada narrative, Meng Wanzhou held over for extradition by Canada. Huawei shut out of Canadian 5G and to the Chinese, POET is a CANADIAN company,that could be leveraged in negotiations, so things cannot go smoothly at this juncture.

There is also the possibility that Singpore, who owned a stake in DL, and put up the grant money for the R&D portion of POET's plan for the DL expansion, has raised an issue of their expectaions

Or, it could simply be a simple banking issue..... it's China, afterall...

IMO, of course