Hi @Mafatu :
I've made a test but did not encountered this problem.
To confirm your problem, I checked the visible property of these two controls. They are all true, so they should be displayed anyway, unless these two controls have been deleted.

So, I have two suggestions:
1. Re-create a Milestones app
2. Create these two buttons manually
Delete project-OnStart
Reset(chkConfirmDelete_Project);
UpdateContext({locDeleteProject: true});
//set focus start
UpdateContext({locSetFocusTimerStart: false});
UpdateContext({locSetFocusControlTarget: "imgCloseWarning_Project"});
UpdateContext({locSetFocusTimerStart: true});
//set focus end
//screen reader start
UpdateContext(
{
locScreenReaderAnnouncedText: With(
{
varAnnouncedText: With(
{
varDefault: "Opening a dialog to confirm deletion of the project",
varOOBTextId: "btnDeleteProject_Announcement"
},
With(
{
varLocalizedText: LookUp(
colLocalization,
OOBTextID = varOOBTextId,
LocalizedText
)
},
Coalesce(
varLocalizedText,
varDefault
)
)
)
},
If(
locScreenReaderAnnouncedText = varAnnouncedText,
Concatenate(
varAnnouncedText,
" "
),
varAnnouncedText
)
)
}
);
//screen reader end

New work item-OnSelect
UpdateContext({locAddWorkItem: true});
Reset(txtAddWorkItemName);
Reset(cmbAddWorkItemTeamMember);
Reset(cmbAddWorkItemMilestone);
Reset(cmbAddWorkItemStatus);
Reset(cmbAddWorkItemCategory);
Reset(cmbAddWorkItemPriority);
Reset(txtAddWorkItemDesc);
Reset(datAddWorkItemTargetDate);
//set focus start
UpdateContext({locSetFocusTimerStart: false});
UpdateContext({locSetFocusControlTarget: "imgCloseAddWorkItem"});
UpdateContext({locSetFocusTimerStart: true});
//set focus end
//screen reader start
UpdateContext(
{
locScreenReaderAnnouncedText: With(
{
varAnnouncedText: With(
{
varDefault: "Opening a dialog to add a new work item",
varOOBTextId: "btnNewWorkItem_Announcement"
},
With(
{
varLocalizedText: LookUp(
colLocalization,
OOBTextID = varOOBTextId,
LocalizedText
)
},
Coalesce(
varLocalizedText,
varDefault
)
)
)
},
If(
locScreenReaderAnnouncedText = varAnnouncedText,
Concatenate(
varAnnouncedText,
" "
),
varAnnouncedText
)
)
}
);
//screen reader end

Best Regards,
Bof