TYPO3 Core

Since some newer version typo3 stores also empty values for flexforms (felogin in this case). Dont know since which version, we normaly never update the felogin plugin settings.
This means that now the value for example settings.pages is empty. This wouldnt be a problem if this empty value would not overwrite the value set per typoscript.
I think at some point typo3 changed the order of how the values in the settings-array of a plugin are evaluated. Or the handling of empty values changed.
The question now is: How can i configure a plugin setting per typoscript, if this is overwriten by an empty flexform value. By "empty" i mean there is a configuration key, but no value associated.

I sorted this report to category "felogin", because i havent found a "flexform" category.