recent change to messages app for emoji and birthday cake icons
Root your phone.
No need to worry
And change these fonts from another device where they show well

/system/fonts/NotoColorEmoji.ttf
/system/fonts/AndroidEmoji.ttf


Set their permissions to chmod 0644 -rw-r--r-
They will be back to normal or if you can install twrp or any other custom recovery i can send you a whole Fonts.zip flashable via recovery to fix this issue