When magma blocks evaporate the water above it temporarily stops creating bubbles
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is duplicated by 2
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Cannot reproduce in 1.13.2 because magma no longer evaporates water above, which is further proven when magma no longer does this if randomTickSpeed is set very high, because it used to work that way in 1.12.2.
Same as I said in the ticket I made, it is a direct result of a fix to MC-125400. The water evaporates, becoming air, which invalidates adjacent bubble columns. A bubble column surrounded on all sides by other bubble columns will become invalid (no source water blocks adjacent to it), then the water block above the middle magma block will be able to evaporate, become air, and invalidate the 4 surrounding columns. This pattern continues and causes a chain reaction. The magma blocks do not evaporate the water above them when there is a bubble column directly above them. If the water is evaporating, it means a bubble column can't form in that spot already. Please update the ticket with these details for clarity on the issue. The behavior you described is intentional and is simply a side effect of the actual bug. Bubble columns require at least 2 consecutive blocks of water above the magma block to be able to form. When the water above evaporates, a bubble column can no longer form until the water fills back in.