Activate it from below. (Chat gets spammed CRUNCH)
Possible ways to break it(step 3):
Activate it again.
Jump near a 2 high wall, so that the runecraft can't be placed (Tall grass does the trick).
Use a teleporter.
Additional info:
When creating a new runecraft, after previous one broke, the name of the rune will be incremented (if last runecraft was: "runecraft_1", new rune will be "runecraft_2". Also after creating a new rune all previously activated runecrafts will now also be called "runecraft_2".
Yes, this is the same bug as #35. It was caused by the "Runecraft was abandoned" check. This has been fixed in 73dcc30fea60dfbfde6a547acfd16ec91a7f7272. Thank you again Amuxix.
I found a few ways that break runecraft
Additional info: When creating a new runecraft, after previous one broke, the name of the rune will be incremented (if last runecraft was: "runecraft_1", new rune will be "runecraft_2". Also after creating a new rune all previously activated runecrafts will now also be called "runecraft_2".
PS: Might be related with #27 and #35