iPadOS in iOS18 with new UITabBarController ... UIBarButtonItems disappear

I have an iPad app using the new UITabBarController on iPadOS18, which is suffering from a new issue from the new layout. Within my tabs, I have a UISplitViewController, with a 2 column layout. If I load the app, it works ok, but if I put the app in the background, and then bring it to foreground, the navigation bar buttons and title just disappear from the splitView controller’s primary view controller.

Before going to background:

After coming back from background:

I also get the following layout issues posted in the debugger consoler:

Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x600002106ee0 UILayoutGuide:0x600003b088c0'TitleView(layout=0x103d18d40)'.trailing <= UILayoutGuide:0x600003b08c40'UIViewLayoutMarginsGuide'.trailing   (active)>",
    "<NSLayoutConstraint:0x600002137520 H:|-(590)-[UILayoutGuide:0x600003b00a80'TabBarGuide(0x103d18810)'](LTR)   (active, names: '|':_UINavigationBarContentView:0x103d18810 )>",
    "<NSLayoutConstraint:0x600002137610 UILayoutGuide:0x600003b00a80'TabBarGuide(0x103d18810)'.width == 0   (active)>",
    "<NSLayoutConstraint:0x6000021414a0 UILayoutGuide:0x600003b088c0'TitleView(layout=0x103d18d40)'.trailing >= UILayoutGuide:0x600003b00a80'TabBarGuide(0x103d18810)'.trailing   (active)>",
    "<NSLayoutConstraint:0x600002148e10 'UIView-Encapsulated-Layout-Width' _UINavigationBarContentView:0x103d18810.width == 585   (active)>",
    "<NSLayoutConstraint:0x600002107570 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x600003b08c40'UIViewLayoutMarginsGuide']-(20)-|(LTR)   (active, names: '|':_UINavigationBarContentView:0x103d18810 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x600002106ee0 UILayoutGuide:0x600003b088c0'TitleView(layout=0x103d18d40)'.trailing <= UILayoutGuide:0x600003b08c40'UIViewLayoutMarginsGuide'.trailing   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

I filed a bug report: FB14971801

Is there something I can do avoid this? It'll make my app pretty unusable if the bar button items just disappear every time the user puts the app in the background and then foregrounds the app.