as always first of all tnx for you work 
i’ve done a new install of zbx5, it seems ok to me… there are only some value to config manually on php.ini settings of php73
and i’v added in /etc/zabbix/web/zabbix.conf.php
$DB[‘DOUBLE_IEEE754’] = ‘true’;
as new installation the history tables of db seems correctly created
see: “Enabling extended range of numeric (float) values on”
https://www.zabbix.com/documentation/current/manual/installation/upgrade_notes_500
tnx i hope to do some more test soon… 