Hello, @Marloes,
Could you tell me please how emojis were added to single-select? Were they selected with our icon/color picker or were they inserted using native OS emoji picker as a part of title?
To me it looks like you inserted native emojis to single-selects but for Workflow field you selected them with our picker. As a part of emoji-color-picker-unification we’ve decided to use Twemoji (twitter emoji) for all non-apple users in our pickers
So, as a workaround you can still insert native emoji to workflow field as a part of text but in that case your colleagues sitting on Linux or Android will see emoji in their OS style (e.g ✅ White Heavy Check Mark Emoji)