About:config save cookiebanners.service.mode

I use Firefox Beta for Android and want to enable the cookie function. However, when I enable or modify this function in “about:config”, it gets reset to the default after restarting the app. The setting in question is “cookiebanners.service.mode”.

Strangely, the value “cookiebanners.service.mode.privateBrowsing” is saved when I change it through the “GUI”.

Is there a way for me to fix this problem, because the cookie banners on the Android system are extremely intrusive and disrupt the user experience?