Right arm sleeve physics bones aren't connected to the main skeleton

[summertriangle-dev]

When wearing a chestpiece that uses sleeve physics (e.g. any of the Myochin Haoris), the right sleeve bone is left detached from the main skeleton. This causes weird behaviour when importing pose files, along with what you'd expect from a bone not moving with its parent.

The left arm equivalent is unaffected and works as expected.