Say/think bubbles stop moving with sprite

[griffpatch]

Expected Behavior

Say / Think bubbles always stay attached to the sprite they originated from (See: #691)

Actual Behavior

Say / Think bubble can become fixed in their position and not move with their sprite / clone

Steps to Reproduce

• Create a stack: When Green Flag Clicked -> Move (10) steps -> Say "Hello!" for (2) seconds.
• Click the green flag a couple of times
• Move the sprite and watch the say block stay where it was.

If it helps, make the delay larger from 2 seconds :). I kind of feel the issue is to do with the promise on a timer and a new say block being instanced which the promise is still active? Perhaps the promise needs cancelling when a new say or think block is executed? However, playing around with this, it is really rather unpredictable :)

Also getting this exception in the console:

This test setup shows how the say until needs cancelling after another say:

And it also has the same issue with the "say for 2" not moving with the sprite, but the second "say for 2" actually moving ok weirdly...

Operating System and Browser

Chrome latest on windows 10