Transfers fail silently

Transfers add-on stopped working in a recent update.

The shortcode mycred_tranfer now shows a drop-down to select point type (even if only one point type is transferable, or types attribute set to a specific point type).

When clicking “Transfer”, the form is shortly disabled then re-enabled. The transfer fails silently (no error message).

The JavaScript console shows the following error: {success: false, data: 'error_invalid_point_type'}

myCred 2.9.4.5 (network activated)