macOS Catalina

Catalina/MacBook Pro: Screen Flashes When Changing User

I just acquired a new-to-me mid 2015 MacBook Pro 15", 2.8 gHz, 1 TB SSD. Under Catalina, 10.15.3, when I change users, just after entering the password and pressing return during log in there is a brief flash of the screen…just a quick blink, then everything proceeds as expected. I rather expect this is normal, but it does not seem to happen when I run the machine (off a flash drive) with El Capitan.

I'm wondering if other people see this blink when changing users under Catalina, if it is normal, or if I should have some concern.

Thank you.

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