I haven't observed this happening with any other blocks.

https://gfycat.com/AdorableShadowyAmericancicada

EDIT: Issue happens with stone blocks too.

Issue occurs with all blocks :(

First, place a whatever block that occupies the same numeral ID as a CTM block. This issue doesn't occur with blocks with extended IDs. Then, place CTM block next to the first block.

https://gfycat.com/OblongIncomparableEwe

Clarification - Issue occurs on all axis.