pollbot: green circles not displaying

[Staniol]

The green circle emojis used by pollbot to display the results of the poll are not displayed properly on Android devices. According to Emojipedia it was added in 2019 and should be supported on all updated systems. However this emoji doesn't display on my phone and is substituted with a crossed rectangle:

Keybase prevents from taking screenshots, so it's complicated to provide proof, but believe me - it doesn't show up in Keybase either.
My phone is OnePlus 5 OxygenOS 9.0.11 (compilation A5000_23_200224) last updated in February 2020. There are no new updates. I've asked my friends and all having Android devices experienced the same issue. However, the green circles are displayed properly on iOS and Windows 10.
Please keep in mind that many older Android devices that are still working won't receive system updates, so it won't start working on them ever.
Maybe it would be better to change used sign to:

• black circle (since 2005)
• white circle (since 2005)
• blue circle (since 2010)

or maybe use a different approach...

[reberthkss]

some progress?