Yes, this is intended as this happens in 1.16, too
Yeah, this was me, I botched some world gen code by mistake. Please tell me if the newer updates fix it!
Iāll test again with the latest version and let you know, thanks.
Excellent. Hopefully it works for you.
Yeah specifically Wither Skeletons are immune, but not regular Zombies and Skeletons.
Ah, so it is a code issue then because because wither skeletons donāt exist as separate entities in 1.7? It seemed like he was saying that wither skeletons get withered by roses. My bad then.
1.7.10 definitely has the Wither already, yep the Wither Skeletons already exist i nthis Version. 
The dangers of replying quicker than one can edit oneās postā¦
Edit: 
would you like me to do it this way then? XD
Weāll allow it 
Still, the whole wither skellies getting withered thing is pretty annoying, itās a shame thereās no way around it. Iām guessing that fixing that would requiring creating a new witherskeleton entity, which would open a floodgate of problems?
Nah you could just make the Wither Rose check if its a Wither Skeleton and then not do the Effect.
Yeah in 1.7.10 the Wither Skeleton and normal Skeleton are the same entity type, but you can call getSkeletonType() on the skeleton entity instance and if itās 0 then its a normal skeleton, or if its a 1 then its a wither skeleton.
I can confirm the latest build does not give me world gen crashes anymore. I tested in one area near where I was previously crashing and didnāt have any issues. I also moved around a little further north too and didnāt have any issues generating more terrain, nice work.
I tested it myself. The Wiki has many factual inconsistencies, nothing beats real testing. They may be immune to the wither potion, but not the flowerās damage.
Wait then why are Wither Roses used for Wither Skeleton Farms? Surely Mojang would not spawn them in those Flowers if they get damaged by them.
Or did you mean your own Flowers?
Edit: Just making sure, Wither Roses in vanilla do NOT sting like Cactii, they only apply the Potion Effect.
Yes they only apply the potion effect. The reason why they do higher amounts of damage when you stand in them is because the damage is based on the time the potion has been active for, which is always 0 when you stand in the rose.
Just in case you did not get any notification from it: I did send you private Messages entailing one definitive infinite Copper Exploit and one random crash I got. ^^
Edit: I found a couple more Issues than the ones I just mentioned, lol.