What is low unemployment and low gdp growth symptomatic of?
One simple explanation can just be that unemployment is artificially low. Perhaps many people went out of the labor force (i.e. stopped looking for a job) after a long period of not being able to find one, and now they don't count as unemployed in the data. Similarly, maybe the economy is not growing enough to create good jobs, but many people are partially employed so that the unemployment rate looks artificially low again because even though people have jobs, they might want to work more hours, but can't.

There might be other more interesting causes, but I think that exploring them will require to zoom in a particular country and take into account the institutional details, etc.