Original top-level domains and many Country-specific TLD's are generally recognized. Generally because the regex is specific and hardcoded rather than being broad and general-scoped.

ICANN generic TLD's (aka: mostly exploitation of companies) are generally not recognized unless the software uses a proper regex (eg: "if it starts with http:// and ends with ._____)

"domain.space" might not be a domain. Did the user forget a space and meant to type "domain. Space"?

Is get.coffee a domain or an accidental period instead of a space?

Report the problem to whatsApp and they might switch from hardcoded domain spotting to a more general regex. Or they might add more of the ICANN TLD's.