1.19.2 Modder Support: can't make custom fluid able to waterlog slabs, stairs etc.

[nikorloss]

I made a custom fluid by following guide of Kaupenjoe on YT, but I'm unable to assign it property of waterlogging any non solid blocks, such as slabs, stairc, walls etc. as well as I can't find any sources or guides on how to do it.

Here is link to my .github repository, any help is appreciated.
https://github.com/AlexOja/Forge_Mod_1.19.2_nikorloss
 

[Toasterkid]

In net.minecraft.world.level.block.SimpleWaterloggedBlock, the functions #canPlaceLiquid and #placeLiquid verify that the fluid water-logging the block is only water.