Parsing error loading recipe supplementaries:hanging_signs/hanging_sign_cactus
com.google.gson.JsonSyntaxException: Unknown item 'structurize:blockcactusplank'
at net.minecraft.world.item.crafting.ShapedRecipe.m_151280_(ShapedRecipe.java:276) ~[server-1.18.1-20211210.034407-srg.jar%23172!:?] ...

Isn't in structurize anymore. They switch it to a new mod. Block now called: domum_ornamentum:cactus_extra (or domum_ornamentum:green_cactus_extra)

supposedly fixed in 1.2.0 since the whole sign system changed

I removed it and added the new one. didn't test this properly but hopefully it should work

I can confirm this is still a problem in supplementaries-1.18.1-1.1.11
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