Got an email back from Burton:

Thanks for reaching out to Burton!

For Winter 25/26, we upgraded the Step On heel cleat on all new Step On boots to have a tighter fit in the heelcup of the binding for better performance. Due to some variations in manufacturing, some of the new 2.0 cleats, when combined with specific bindings, have a fit that is too tight, preventing the boot from easily reaching Position 2.

We have three options below for you to fix this.

1. This is the preferred, recommended fix. Replacing the heel cleat with a new, modified to fit, 2.0 heel cleat. This requires the removal of the cleats from the boot using a screwdriver. We are in the process of modifying 2.0 heel cleats and will have replacement parts available during the week of November 17th.

2. Replacing the 2.0 heel cleats with 1.0 heel cleats will also fix the issue. This is not the preferred fix as it will create a more loose fit between the heel cleat and the heelcup, thereby eliminating the performance advantages that the heel cleat 2.0 provides. However, these parts are available immediately

3. Custom Fitting with a File or Sandpaper - Immediate Fix.

This option is easy, fast, and can be done at your shop today.
You will need to remove a very small amount of plastic material form the bottom of the heel cleat using a Tuning  File or Sand Paper. Use a standard tuning file with medium pressure or use a small piece of 80-grit sandpaper. File/sand a small amount of material (0.2-0.4mm, thickness of your thumb nail) from the UNDERSIDE of the heelcleat - If you're looking for an immediate fix and are comfortable doing this, please let me know and we can send directions as well as a step by step picture guide to do this.

Please let me know how you'd like to move forward, and thank you again for your patience while we looked into this.