Annoying Warning in HFSS

[FedorS]

Hi guys. I have a little problem here with HFSS. Its Version 2023R1.
I built a patch antenna, tried to use symmtry boundary. But I alway get this Warning:
" [warning] The following symmetry boundaries do not touch the background: 'Sym1' . This may produce incorrect results"
I know many people use symmetry bounday wrong, but my splits even PML Volume. Anyway I tried to split different parts of the board, It didnt help
I attached the project file. just change .txt to .aedt.
Thanks for help, If any additional questions, please ask.

 

[vfone]

Frankly, I don't know what is the reason, but removing the boundary Sym1, the simulation runs fine.