Same here. Thank you for your issue. Please give more information about your version incl. templates, framework and additional plugins. (with my 3.10.8 and t4_bs5_blank 1.1.2 template it works, (but with t4_bs5_blank 1.1.3+ there's a problem but with joomla content too)
Is there someone else who encounter this problem too?
on JEM 2.3.3 stable in latest Joomla (3.10.2) Protostar php7.4.15
Personally I use t4_B5 template with t4_system plugin framework with bootstrap 5 and fontawesome)
(I prefer free "Signal" or paid "Threema" instead of "Whatsapp".)