Hi @bhitchlock,
Do you custom a form for your SP list using PowerApps?
Do you want to switch to the Edit form after you created a new item in your SP list?
I have made a test on my side, please take a try with the following workaround:

I created separated forms to create, edit or show the list item in custom form via the following blog:
https://powerapps.microsoft.com/en-us/blog/separate-custom-forms/
On your side, you could consider take a try to custom your three separated forms as a mentioned above.
Set the OnNew property of the SharePointIntegration control to following:
Set(CurrentSubmitted, Blank()); /* <-- Reset CurrentSubmitted variable */
Set(SharePointFormMode, "CreateForm");
NewForm(CreateItemForm);
Navigate(CreateScreen, ScreenTransition.None)
Set the OnEdit property of the SharePointIntegration control to following:
Set(CurrentSubmitted, Blank()); /* <-- Reset CurrentSubmitted variable */
Set(SharePointFormMode, "EditForm");
EditForm(EditItemForm);
Navigate(EditScreen, ScreenTransition.None)
Set the OnSave property of the SharePointIntegration control to following:
If(SharePointFormMode="CreateForm", SubmitForm(CreateItemForm), If(SharePointFormMode="EditForm", SubmitForm(EditItemForm)))
Set the OnSuccess property of the CreateItemForm (New Form) to following:
Set(CurrentSubmitted, CreateItemForm.LastSubmit);
ResetForm(CreateItemForm);
EditForm(EditItemForm);
Set(SharePointFormMode, "EditForm");
Navigate(EditScreen,ScreenTransition.None)
On your side, you should type:
Set(CurrentSubmitted, YourNewForm.LastSubmit);
ResetForm(YourNewForm);
EditForm(YourEditForm);
Set(SharePointFormMode, "EditForm")
Navigate(EditScreen,ScreenTransition.None)
Set the Item property of the EditItemForm (Edit Form) within your Edit screen to following:
If(
IsBlank(SharePointIntegration.Selected) || IsEmpty(SharePointIntegration.Selected),
First('20190211_case5'),
If(!IsBlank(CurrentSubmitted), CurrentSubmitted, SharePointIntegration.Selected)
)
On your side, you should type:
If(
IsBlank(SharePointIntegration.Selected) || IsEmpty(SharePointIntegration.Selected),
First('YourSPList'),
If(!IsBlank(CurrentSubmitted), CurrentSubmitted, SharePointIntegration.Selected)
)
Please check the attached GIF screenshot for more details:
Best regards,