I have a large (12*12) bone meal generator using crimson nylium and Pistons to move the nylium blocks to break the roots and fungus that are created, then every so often it pours water over the blocks to move the broken objects to hoppers and composters.

It is very laggy and twice I have had a partial row of nylium just vanish, but that is not the bug I am reporting today.

When I logged in this morning, one corner of my nylium now has a 3*3 section that is immovable, untouchable white blocks. Tools do not operate on them, I cannot attach other blocks to them. They act solid in the sense that water still flows over them.

Due to the lag, it is not unusual to see the whole nylium area flash white as the generator is operating, however it appears that these blocks somehow got stuck in that state.

The generator spans chunks in both the X and Z directions (though it is all within a ticking area) and this 3*3 section is all of it that is in that particular chunk.