I haven't been able to reproduce this bug. I may have seen a horse choke on a dirt wall once, but nothing on the scale that users here have been reporting. Perhaps it's an incompatibility with a different mod. So anyone who sees this bug: can you try again with only Repose and Farseek mods loaded, and let me know? And if it still happens, perhaps post a picture or video? Thanks.
Try adding Primitive Mobs and disable everything but the chameleons. Turn the chameleons up to spawn a lot. Then just stand in a field and listen to them hurting themselves
I was thinking they stumbled into a patch of poison ivy (Biomes o' Plenty I think), but no, it appears to be every time they step up anywhere.
I'd be still on the lookout for that combo bug (the one that killed my multiplayer server map with its duplicating soul sand), but given the suffocation bug I'm gonna bow out of this mod for a while. I hope you manage to fix it because it really is quite pleasant to be able to walk up areas like this!
Note: You might consider making it so animals that are under a block high don't treat the land like a slope but like vanilla blocks, having to jump up. Might be a bit more realistic anyway, and could get rid of the problem (potentially).
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My YouTube channel is currently on hiatus, but I hope to get back to it at some point. Content is fairly random, but can be enjoyable, and is mostly game footage (mostly random Minecraft clips) from my nephews and me. Most popular MC vid so far is the one Vechs laughed at on Twitter!
And I was just thinking the same thing about all the Abbyssalcraft grasses and stones - you've got those ores listed though. Atum too but this is really getting into a territory of how far to config / interact with other mods present.
I.E. uids abyssalcraft:darkstone abyssalcraft:abystone abyssalcraft:dreadstone abyssalcraft omotholstone
and abyssalcraft:darkgrass abyssalcraft:dreadgrass
Also, the config option is likely best as TiCon slime islands falling out of the sky b/c dirt collapse is turned on can be a bit too much.