IBUS receiver does not work in BF 4.5.0 RC 3 (on my OMNIBUSF4SD FC)

[wterreb]

Describe the bug

IBUS receiver on my OMNIBUSF4SD works perfectly in BF 4.4.3
But after I upgrade to 4.5.0 RC3 it does not work anymore.
If I go back to 4.4.3 again then it works again. Problem seem to only occur on 4.5.0 (I tried with RC2 and RC3)

To Reproduce

Upgrade OMNIBUSF4SD to BF 4.5.0 RC3 and choose IBUS as the radio protocol.

Expected behavior

After upgrade, IBUS receiver should continue to be detected and work

Support ID

00f2b709-6ece-48cc-9420-eec874dacae1

Flight controller

OMNIBUSF4SD

Other components

FlySky2A IBUS receiver

How are the different components wired up (including port information)

Receiver connected to Ibus input

Add any other context about the problem that you think might be relevant here

No

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs within a week.

[blckmn]

@SteveCEvans can this be in maintenance also please.

[SteveCEvans]

I don't have any IBUS kit. This is a classic case for a git bisect to find the commit that fixed it. Do any of the devs use this?