flooring disappears after upgrading treehouse

[forest parcel]

i bought and used a gray tile flooring and placed it on my top floor and then upgraded to the level 3 treehouse and it disappeared and reverted to the default flooring, the one in my inventory is the default flooring as well

[azure nexus]

same issue here. not in pot or lost in found

[tight oar]

you got before and after pics?

[forest parcel]

and to show its not in my inventory

the other 2 floorings i bought afterwards