Option data are not saved/retrieved on LO but work fine on OO

I have developped an addon to writer and I tried it on OO and on LO. Apparently, it works normally on both LO and OO, except the fact that on LO, the option data save/load mecanism doesn’t work.

It seems that my programming is ok as it works fine on OO.
Test have been done on Linux (Gentoo, Mint) and Windows. The result is the same. Arch 64 bits.

Can somebody help me understanding.

Thanks