Noto Color Emoji not consistently used

It is great to see that Emojis are shown in Ubuntu 20.04 in most apps. But it is not consistent which emoji foint is shown. I had to delete other emoji fonts than the Noto Color Emoji package to have Noto be shown in Wire Messenger and Evolution.
But with only Noto installed it seems that certain applications still don't show emojis with Noto.
How could this be fixed?

At the end of this Ask-Ubuntu-answer (https://askubuntu.com/a/1045916/30631) there was a tip to create a ~/.config/fontconfig/conf.d/01-emoji.conf file and this helped to get Thunderbird show the Noto emojis in the new email window but when I look at a sent emails the emojis are only black & white.
Could this tool help: emoji.conf · GitLab — https://gitlab.com/es20490446e/emoji.conf ?

If I should ask this question somewhere else, thank you in advance for guiding me!