Hello everyone, I'm new to Odoo. I am creating a module with a mechanism similar to odoo's project module. When I create a stage for a project, I declare the stage field as Many2One so that users can add stages without limitation. However, when I try to attach widget ="statusbar" to the stage view and run odoo, I always get the following error

Uncaught Promise > An error occurred in the owl lifecycle (see this Error's "cause" property)

OwlError: An error occurred in the owl lifecycle (see this Error's "cause" property)

     at handleError (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1472:101)

     at owl.App.handleError (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:2098:29)

     at Fiber._render (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1497:19)

     at Fiber.render (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1495:6)

     at ComponentNode.initiateRender (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1563:47)

Caused by: TypeError: Cannot read properties of undefined (reading 'map')

     at StatusBarField.getVisibleMany2Ones (http://localhost:8069/web/assets/979-ab892c4/web.assets_backend.min.js:3741:58)

     at StatusBarField.computeItems (http://localhost:8069/web/assets/979-ab892c4/web.assets_backend.min.js:3744:75)

     at StatusBarField.template (eval at compile (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:2056:374), :43:54)

     at Fiber._render (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1496:96)

     at Fiber.render (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1495:6)

     at ComponentNode.initiateRender (http://localhost:8069/web/assets/963-8b4659c/web.assets_common.min.js:1563:47)

Why does this happen? If I use fields.Selection the statusbar works fine but Many2One doesn't.