I use DeepL translation as I'm not English native.

I get an error when I try to add a recipe for PRC in MekCEu.
I use example PRC recipe.
https://cleanroommc.com/groovy-script/mods/mekanism/pressurized_reaction_chamber

error log

An exception occurred while running scripts. Look at latest.log for a full stacktrace:

groovy.lang.MissingPropertyException: No such property: pressurized_reaction_chamber for class: mekanism.common.integration.groovyscript.MekanismAdd
Possible solutions: pressurizedReactionChamber
at postInit.mekanism.run(mekanism.groovy:12)
at com.cleanroommc.groovyscript.sandbox.GroovySandbox.runScript(GroovySandbox.java:167)
at com.cleanroommc.groovyscript.sandbox.GroovyScriptSandbox.runScript(GroovyScriptSandbox.java:181)
at com.cleanroommc.groovyscript.sandbox.GroovySandbox.loadScripts(GroovySandbox.java:140)

GroovyScript provides support for base Mekanism, and Mekanism CEu. any issues with compatibility are on Mekanism CEu's end, and you should open an issue on their repository.