FTB Direwolf20 1.12.1, MC 1.10.2

I'll be posting this both here and on RFTools' page, since I have no idea which one is misbehaving.

I have a one chunk-sized (15x15, inside one chunk) farm with EnderIO's Farming station farming Canola. I placed Greenhouse Glass on top of every block on the farm. The farm resides in RFTools-created dimension. ("Dim9" from now on). It's a flat, eternal day -type dimension with not much in it.

While I'm inside Dim9, nothing spectacular happens and everything seems to work fine. Using TickProfiler, the TE column shows a number around 3-5k (I have little idea what this number does, but I'm guessing TE is for Tile Entity and the number is the bigger the more "things" are going on. I'm guessing it's the count. This will become relevant in a sec). For reference, the overworld has a number around 8-9k (it contains most of my automation, including a quite extensive Refined Storage system.

Anyway, when I LEAVE that dimension, in a minute or so the game becomes laggy and the server begins to throw "can't keep up" messages and skipping ticks, sometimes hundreds or thousands. After awhile the server becomes too unresponsive to play.

Using TickProfiler I tracked it down to Tile Entities and using Entity Counter, I bumbed into a weird thing: TileEntityGreenhouseGlass keeps climbing up and up and up. Reaching up to 600k before the server crashes. This does NOT happen when I'm in that dimension, though after the count is above 150k or so, joining the dimension becomes impossible and the client times out because the server doesn't reply in time.

Sorry, but after more troubleshooting, I don't believe it's the greenhouse glass. I removed ALL of it from the farm and now the same thing started to happen to EnderIO conduits.

Here's the RFTools page on this matter: McJtyMods/RFTools#1336

Yeah, didn't think the greenhouse glass was going to spontaneously start multiplying to no reason, so uh, yeah...
Probably has to do with the weird way RFT dims freeze when nobody is inside them or they're unpowered or whatever.
But anyway, def not AA's end.

For anyone interested, this doesn't seem to be RFTools' "fault" either: FTBUtilities chunk loading capability runs havoc with RFTools dimensions and causes weird problems like this to appear.