[joy-ui][Accordion] First/Last style problems

[remitoffoli]

Steps to reproduce

Link to live example: https://codesandbox.io/p/sandbox/joyui-accordion-first-last-6k8zvz

Steps:

1. Create an rounded AccordionGroup with Accordions inside
2. Replace Accordions components with Custom components wrapping Accordions
3. Or add conditions around the first or last accordion that return "false" or "null" if falsy

Current behavior

The first and last Accordion items are not set properly (data-first-child and data-last-child are not set).

While hovered, first's/last's backgrounds overlap with the border. And the last child is displaying an extra border.

Expected behavior

Same style as normal use.

Context

Using the latest version of JoyUI (5.0.0-beta.22)

Found this maybe-related issue: #40272

[danilo-leal]

Hey! 👋 Thanks for opening this issue; seeing some Joy UI love is awesome! Just passing by to share that the team might take a bit longer to get back on Joy UI-related issues due to the focus on the two major releases coming up for Material UI this year. Didn’t want to leave issues with the “waiting maintainer” status forever :) Definitely feel free to share any progress you’ve had on the issue, if any, though!

[aacevski]

Hey y'all - I opened a proposal pull request here:
#41457 🚀