To be frank, we don't have much idea of how 实木 is/should be installed, so my understanding/interpretation could be wrong.
Here is what's in the home inspection report.
1.Comments: BOARDS NOT SECURE TO UNDERLAYMENT AT FIREPLACE -
REFER TO WOOD FLOOR SPECIALIST FOR FURTHER OPINIONS / REPAIRS.
Does this look serious?
2. The center wood flooring is supported by 4X6 floor girders
on approx. 4 foot centers resting on wooden posts and concrete
piers on approx. 6 foot centers.