Advanced Customization Entity Wizard: issues with Recent List and images

SUGGESTED

I've recently added several new entities to a demo CRM, all using the Advanced Customization Entity Wizard.  It seems that half the time everything works fine, but it's not uncommon that the new entities do not display in the Recent List after navigating to the Summary page.  Similarly, although I've replaced all of the Summary and small_ gifs, sometimes the icons display and sometimes they don't.

I'm following identical procedures for these new entities, so it seems there's no rhyme-or-reason as to why they don't work correctly 100% of the time.

Just wondering if anyone has seen similar behavior with the results of the adv entity wizard.  I've had this intermittent problem since 2017, with the latest in 2019 R2. 

Thanks.