Got the rocky armor from the rocky roller shells and absolutely love the rolling effect.

The server crashed on me (hosted by a friend) and when the server was started up again I could no longer roll with the armor. I can still fast-sneak with the raccoon hat, wall-climb with the centipede pants, and I still sink in water when wearing the rocky armor but sprint no longer makes me roll.

I had the server restarted again to check that wasn't the cause. I had removed and re-equipped the armor. I /gave myself a new rocky armor. I tried dying, with and without the armor on. The only thing that got it back was dumping my stuff in a chest and having my friend delete my player data. I suspected this would work because my friend was able to roll still, and when I fired up a single-player game I was able to roll in that.

After another long play session, multiple connect/disconnects (user-initiated, no further crashes), I am unable again to use the roll.

So, after a period of maybe 2 hours of playing, followed by an AFK session of maybe 3 hours, the rolling ability returned again. This is an otherwise indeterminate period of time from when the issue arose (although I'm typically a very active player so likely several hours up to probably dozen hours of the issue persisting).

The server is no longer in an "active 24/7" state (server host is playing DL2 now, giving MC a break for a bit) so I'm not able to rigorously test and report anymore, however figured I might as well give an update.

For the sake of verbosity and full disclosure, the mod version is alexsmobs-1.15.1.jar and it's via the "Create on a Potato" for 1.18.1 mod pack. I think separate from stock I have OptiFine installed too but only for the non-shader parts of it since it busts the rendering of Create entities. Xaero's is also the latest instead of the shipped. I doubt these mods conflict at all but I've also dabbled in programming and know that sometimes things can be weird and unexpected.

I have a copy of the server on one of my machines (I was hosting it at first) with a much earlier world file that I can fiddle around in if logs or the like are necessary.