User feedback has been that the pinned modifier looks broken because
there is no feedback in the UI showing that it's pinned (related to the
recently reported #121620). It's also inconvenient to disable the pinning
if it's required to move the modifier up (before another modifier that
controls normals for example). Now the "Pin" icon is displayed here,
and clicking on it turns off the pinning.
Also, change the property name from "Stick to Last" to "Pin to Last".
"Stick" is a weird word in the UI, it sounds uncommon and strangely
physical. "Pin" is more associated with this concept.
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Pull Request: https://projects.blender.org/blender/blender/pulls/122444
7ee189416c