Setting the randomTickSpeed via /gamerule command can cause stalactites to grow more than 7 blocks long

What the player did:

Creating a valid structure for stalactites to grow, setting the randomTickSpeed to 30000 and waiting.

What I expected to see:

A stalactite should meet the stalagmite produced by it within 7 blocks from it (according to the update log), or should otherwise fail to generate a stalagmite and stops upon reaching 7 blocks.

What actually happened:

The rightmost stalactite (closer to the player) extended to a length of 9 before joining the stalagmite below.