System keychain keeps locking

I was getting continued prompts to enter my password for some code signing and eventually discovered that I could unlock the system keychain, which I did.

However, it keeps locking by itself, seemingly when I click on another chain, and possibly even by itself sometimes. The "Login" window has the option to change lock settings but it is current configured to never lock.

Any idea how to fix this? This is on macOS 10.15 which I still need to keep around to build versions of my product for older systems.

Thanks in advance

System keychain keeps locking
 
 
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