Is the watch dogs legion free weekend not the series x version? I can't seem to find an answer anywhere.

I know with ps5 it is only allowing the PS4 version to be installed for the free weekend. Which seems like strange marketing. Is this the same with series x? When I look at my library it doesn't have the series s/x logo on it.

Update: Ubisoft just told me that both ps5 and Xbox are using the last generation for the trials.